Robert Cosgriff Lyle Guyon Nathan De Jager Shelby Weiss Yao Yin Deanne Drake Bruce Henry David Herzog James Lamer Eric Lund Andrew Meier Megan Moore Molly Van Appledorn Benjamin Vandermyde 20250711 tabular digital data Online U.S. Geological Survey The data used in this study were collected through the U.S. Army Corps of Engineers’ Upper Mississippi River Restoration (UMRR) Program Long Term Resource Monitoring (LTRM) element. https://doi.org/10.5066/P13DMXPN Throughout the Upper Mississippi River System (UMRS), floods in 1993 and 2019 were record-setting events in terms of flood stage and duration of flooding. Floodplain tree species are adapted to survive moderate frequencies, intensities, and durations of inundation. These events generated interest in quantifying levels of tree mortality and presented an opportunity to study how differences in flood attributes may affect tree survivorship and forest community dynamics post-flood. In 1995, 547 plots randomly located within forested land cover were established within seven reaches on the Upper Mississippi River (Pool 4, Pool 8, Pool 13, Pool 17, Pool 22, Pool 26, Open River) and one reach of the Illinois River (La Grange Pool). In 2021, 39-46 sites (n = 342) from each of the eight reaches were navigated to using GPS coordinates from the original study and resurveyed using the same field sampling protocol used in 1995. In many cases (n = 287), the original posts and tree tags installed in 1995 could not be found and thus plots in 2021 were re-established by navigated as close to the original GPS coordinates as possible and referencing the 1995 data. In some of these cases (n = 24), plots were inaccessible (e.g., in a water body) due to landform changes that had occurred in the intervening years between field sample collections, and in these instances, plots were relocated to a nearby site with similar forest composition, elevation, and river geomorphology. Plots were re-established in order to maintain a consistent number of plots per reach for potential future monitoring, however, those that were moved were noted along with original 1995 coordinates in the provided ‘Plot_2021.csv’ file and can be included or removed in subsequent analyses depending on research questions and goals. Plots were sampled using a fixed radius sampling methodology with a radius of 10 meters, and data collected included: overstory species composition, diameters, and health status; canopy cover; seedling counts and composition; cover classes for different forest height strata; ground cover; and herbaceous cover. Seedlings, ground cover, and herbaceous cover were measured within ten randomly located 0.5 m x 0.5 m subplots. These data were collected with the purpose of assessing post-flood effects on floodplain forest plant communities and subsequent successional dynamics following the 1993 and 2019 floods across the UMRS. Plots were established within seven reaches of the Upper Mississippi River and one reach of the Illinois River. 19950531 20210927 observed Complete None planned The study area encompasses seven reaches on the Mississippi River (Pools 4, 8, 13, 17, 22, 26, and Open River) and one reach of the Illinois River (La Grange Reach) -92.6525 -88.9954 44.5372 37.1911 ISO 19115 Topic Category biota environment None floodplain forests forest dynamics forest succession Upper Mississippi River Restoration Program Mississippi River forest community USGS Thesaurus vegetation field inventory and monitoring floods Alexandria Digital Library Feature Type Thesaurus floodplains wetlands biogeographic regions USGS Metadata Identifier USGS:6734d8dfd34e6fbce7b5c62d None Illinois River Common geographic areas Mississippi Upper Mississippi Minnesota Wisconsin Iowa Illinois Lower Illinois Missouri None Acer saccharinum Quercus Fraxinus Ulmus Forestiera acuminata Morus Cephalanthus occidentalis Carya Lonicera Salix nigra Salix Ilex verticillata Populus deltoides Cornus Rhamnus cathartica Betula nigra Cornus sericea Celtis occidentalis Taxodium distichum Acer saccharum Diospyros virginiana Platanus occidentalis Sambucus Catalpa speciosa Gleditsia Rubus flagellaris Acer negundo Asimina triloba Liquidambar styraciflua Prunus virginiana Kingdom Plantae Subkingdom Viridiplantae Infrakingdom Streptophyta Superdivision Embryophyta Division Tracheophyta Subdivision Spermatophytina Class Magnoliopsida Superorder Rosanae Order Sapindales Family Sapindaceae Genus Acer Species Acer saccharinum TSN: 28757 Species Acer saccharum TSN: 28731 Species Acer negundo TSN: 28749 Order Fagales Family Fagaceae Genus Quercus TSN: 19276 Family Juglandaceae Genus Carya TSN: 19223 Family Betulaceae Genus Betula Species Betula nigra TSN: 19480 Order Rosales Family Ulmaceae Genus Ulmus TSN: 19048 Family Moraceae Genus Morus TSN: 19064 Family Rhamnaceae Genus Rhamnus Species Rhamnus cathartica TSN: 28573 Family Cannabaceae Genus Celtis Species Celtis occidentalis TSN: 19040 Family Rosaceae Genus Rubus Species Rubus flagellaris TSN: 24921 Genus Prunus Species Prunus virginiana TSN: 24806 Order Malpighiales Family Salicaceae Genus Salix TSN: 22476 Species Salix nigra TSN: 22484 Genus Populus Species Populus deltoides TSN: 22445 Order Fabales Family Fabaceae Genus Gleditsia TSN: 26711 Superorder Asteranae Order Lamiales Family Oleaceae Genus Fraxinus TSN: 32928 Genus Forestiera Species Forestiera acuminata TSN: 32952 Family Bignoniaceae Genus Catalpa Species Catalpa speciosa TSN: 34315 Order Gentianales Family Rubiaceae Genus Cephalanthus Species Cephalanthus occidentalis TSN: 34786 Order Dipsacales Family Caprifoliaceae Genus Lonicera TSN: 35281 Family Adoxaceae Genus Sambucus TSN: 35315 Order Aquifoliales Family Aquifoliaceae Genus Ilex Species Ilex verticillata TSN: 27985 Order Cornales Family Cornaceae Genus Cornus TSN: 27798 Species Cornus sericea TSN: 501637 Order Ericales Family Ebenaceae Genus Diospyros Species Diospyros virginiana TSN: 23855 Superorder Proteanae Order Proteales Family Platanaceae Genus Platanus Species Platanus occidentalis TSN: 19020 Superorder Magnolianae Order Magnoliales Family Annonaceae Genus Asimina Species Asimina triloba TSN: 18117 Superorder Saxifraganae Order Saxifragales Family Altingiaceae Genus Liquidambar Species Liquidambar styraciflua TSN: 19027 Class Pinopsida Subclass Pinidae Order Pinales Family Cupressaceae Genus Taxodium Species Taxodium distichum TSN: 18041 None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Shelby Weiss National Great Rivers Research and Education Center Post-doctoral research associate mailing and physical

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East Alton Illinois 62024 United States 618-468-2834 saweiss@lc.edu U.S. Army Corps of Engineer’s Upper Mississippi River Restoration Program, U.S. Army Corps of Engineers, National Great Rivers Research and Education Center, Minnesota Department of Natural Resources, Wisconsin Department of Natural Resources, Illinois Natural History Survey, Missouri Department of Conservation No formal attribute accuracy tests were conducted. A visual inspection of the data set values was performed and found to be accurate. Data were spot checked for logical accuracy: values fall within expected ranges and duplicates/omissions checked. Data set is considered complete for the information presented, as described in the abstract. Only tree data are available for the collection year 1995 (no other CSVs). Users are advised to read the rest of the metadata record carefully for additional details. Accuracy of horizontal positional information in the data set has not been formally assessed. Accuracy of vertical positional information in the data set has not been formally assessed. Data were collected during the growing seasons of 1995 and 2021 within eight reaches of the Upper Mississippi River System. Crews navigated to corresponding plot GPS coordinates and upon arrival, monumented plot centers in some fashion (i.e. steel post, rebar, pin flag, etc.). In addition to marking plot center, two live (healthy) trees >3.5 inches were chosen as reference points. Tree species, diameter at breast height (dbh), distance from plot center, and azimuth were recorded for each selected reference tree. Each plot contained ten 0.25 m² quadrats. Within quadrats, woody seedlings were identified, their heights measured, and approximate ages recorded. Also within quadrats, canopy coverage of woody species and percent cover of herbaceous species were estimated by height category. Quadrat cover class for the following categories were also recorded: overstory, subcanopy, understory, and woody vine cover using incremental cover estimates. Ground cover was also estimated at each quadrat in increments of Trace (T) for covers equal to or less than 1% and then in 5% increments thereafter for live standing trees (>2.5 cm diameter), down dead woody (> than 12.7 cm diameter), litter (dead plant material to include leaves and ddw < 12.7 cm diameter), bare ground, rock, water, and basal vegetation. Basal vegetation was a summation of all stems (< 2.5 cm dbh) within the quadrat. The total ground cover totaled to 100%. Within the entire plot, all trees >2.5 cm dbh were recorded, noting tree species, dbh, and vigor. Vigor was defined as dead prior to flood (D), dead after flood (FL), stressed (S), and currently vigorous/healthy (V). Following data collection, data were entered into excel spreadsheets and reviewed for errors. Only tree data are available for the 1995 sampling year. 2021 Shelby Weiss National Great Rivers Research and Education Center mailing and physical

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East Alton Illinois 62024 United States (618) 468-2834 saweiss@lc.edu Data were merged across reaches into six CSV files for each type of data collected: Plot information, tree data, seedling data, herbaceous data, ground cover data, and cover class data. Field names were edited for consistency across reaches before being merged. Coordinates provided for plot data were converted to UTM Zone 15 where needed for consistency. Data within each field of each CSV were assessed for missing values and values falling outside of the range of expected values. Whether a historical marker had been found from the 1995 sampling period during the 2021 survey was assessed by referencing the notes provided by field crews and recorded in a new column called 'Resample_status.' In one case the identify of a plot ID was discovered to have been mislabeled at one of the sites in pool 4 (Plot 68 was recorded as Plot 69). The Plot ID was accordingly adjusted to across CSV files. For woody seedlings, observations were filtered and restricted to those under 4.5 ft as any above 4.5 ft were already recorded in the tree data. For all categorical percent cover estimates, when estimates fell outside of the defined categories, they were adjusted to fall within the closest defined category. 2024 Shelby Weiss National Great Rivers Research and Education Center mailing and physical

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East Alton IL 62024 United States (618) 468-2834 saweiss@lc.edu Universal Transverse Mercator 15 0.9996 -93.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1983 GRS 1980 6378137.0 298.257222101 PlotData_2021.csv Comma Separated Value (CSV) file containing data. Producer Defined Pool Upper Mississippi Navigation Pool. Pools included in this study were 4, 8, 13, 17, 22, 26, Open River, and La Grange Pool on the Illinois River Producer Defined LG La Grange Pool (Illinois River) Producer defined 17 Pool 17 Producer defined 8 Pool 8 Producer defined 26 Pool 26 Producer defined 22 Pool 22 Producer defined 4 Pool 4 Producer defined OR Open River Producer defined 13 Pool 13 Producer defined PlotID Unique within-pool identification number (duplicates exist between pools so for a truly unique identify Pool and PlotID must be used together) Producer Defined 1 110 Canopy_Perc Percent cover of the canopy layer. Producer Defined NA No Data/Not recorded Producer defined 0 100 Subcanopy_Perc Percent cover of the subcanopy layer. Producer Defined NA No Data/Not recorded Producer defined 0 95 Date Date collected (M/D/YYYY) Producer Defined NA No Data Producer defined Date Field_Crew Initials of individuals who collected the data. Producer Defined NA No Data Producer defined Field crew member initials Notes Notes about the site provided by the field crews. This includes notes on whether crews could confirm they had found an original site with a historic marker. Producer Defined NA No Data Producer defined Notes taken in the field UTM_N UTM Zone 15 northing of plot center in 2021. Different coordinates from 1995 does not always mean a plot was moved. In many cases, crews updated coordinates even at sites where historical markers were found. Producer Defined NA No Data Producer defined UTM Zone 15 northing UTM_E UTM Zone 15 easting of plot center in 2021. Different coordinates from 1995 does not always mean a plot was moved. In many cases, crews updated coordinates even at sites where historical markers were found. Producer Defined NA No Data Producer defined UTM Zone 15 easting UTM_N_95 Original UTM Zone 15 northing established in 1995. Producer Defined NA No Data Producer defined UTM Zone 15 northing UTM_E_95 Original UTM Zone 15 easting established in 1995. Producer Defined NA No Data Producer defined UTM Zone 15 easting Resample_status Interpretation based on notes provided by field crews on whether historical markers were found at sites and/or crews could determine they were at or close to the original plot center. Producer Defined Not noted Surveyor did not note whether or not a historical marker was found Producer defined Moved Plot center was noted as moved to a new location, likely due to access issues or changes in geomorphology. Producer defined Confirmed with historical marker Crews confirmed they were at the 1995 plot center by finding a historical marker, such as a post or tree tag. Producer defined Presumed Notes indicate that crews were at or close to the1995 plot center location based on prior field data. Producer defined 1995 tree data not present No 1995 data at this site. Producer defined 2021 tree data not present No 2021 data at this site. Producer defined No 95 coords No 1995 coordinates recorded. Producer defined PoolPlotID Combined Pool and PlotID to create a unique plot identifying across all reaches. Producer Defined << empty cell >> No Data Producer defined Plot identification number HerbaceousData_2021.csv Comma Separated Value (CSV) file containing data. Producer Defined Pool Upper Mississippi Navigation Pool. Pools included in this study were 4, 8, 13, 17, 22, 26, Open River, and La Grange Pool on the Illinois River Producer Defined LG La Grange Pool (Illinois River) Producer defined 17 Pool 17 Producer defined 8 Pool 8 Producer defined 26 Pool 26 Producer defined 22 Pool 22 Producer defined 4 Pool 4 Producer defined OR Open River Producer defined 13 Pool 13 Producer defined Plot Unique within-pool identification number (duplicates exist between pools so for a truly unique identify Pool and PlotID must be used together) Producer Defined 1 110 Subplot.# Subplot identifier. Ten 0.5m x 0.5m square subplots were measured per plot. Producer Defined 1 10 Species Original code used corresponding to a species name. Largely consistent with USDA PLANTS database codes. Producer Defined data missing No Data/Data sheet lost Producer defined Species four letter code. 'NO VEG' indicates a lack of herbaceous species present in the subplot. 'UNKNOWN' was recorded when crews were unable to identify the species. Height.Class Height category recorded in 1 ft increments Producer Defined NA No Data Producer defined 0 20 Cover.(%)_raw Percent cover estimates. Crews primarily recorded cover in increments of: 0, T, 5, 25, 50, 75, 95, 100. However, in some cases percentages were recorded in greater detail (e.g., increments of 5%) and so are retained here, though it is advised not to use these values to compare across reaches since the level of precision deviated. In between reach comparisons are desired, use 'Cover.(%)_clean'. Producer Defined NA No Data Producer defined Percentages Cover.(%)_clean Percent cover estimates recorded in increments of: 0, T, 5, 25, 50, 75, 95, and 100. In some cases crews recorded a greater level of precision in the field, so in these cases, values were rounded to the nearest defined increment during data cleaning so that methods and levels of precision are consistent and can be compared across reaches. Producer Defined NA No Data Producer defined Percentages Notes Additional notes provided by field crew Producer Defined NA No Data Producer defined Notes taken in the field usda_code Code from the USDA PLANTS database corresponding to a species name Producer Defined NA No Data Producer defined Code from the USDA PLANTS database corresponding to species. 'NO VEG' indicates a lack of herbaceous species present in the subplot. 'UNK' was recorded when crews were unable to identify the species. GroundCover_2021.csv Comma Separated Value (CSV) file containing data. Producer Defined Pool Upper Mississippi Navigation Pool. Pools included in this study were 4, 8, 13, 17, 22, 26, Open River, and La Grange Pool on the Illinois River Producer Defined LG La Grange Pool (Illinois River) Producer defined 17 Pool 17 Producer defined 8 Pool 8 Producer defined 26 Pool 26 Producer defined 22 Pool 22 Producer defined 4 Pool 4 Producer defined OR Open River Producer defined 13 Pool 13 Producer defined Plot.ID Unique within-pool identification number (duplicates exist between pools so for a truly unique identify Pool and PlotID must be used together) Producer Defined 1 110 Subplot.# Subplot identifier. Ten 0.5m x 0.5m square subplots were measured per plot. Producer Defined 1 10 LTS Live tree standing (>2.5 cm diameter) percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage DDW Down dead woody (>12.7 cm diameter) percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage Litter Litter (dead plant material to include leaves and down dead woody < 12.7 cm diameter) percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage Basal.Veg Basal vegetation (a summation of all stems < 2.5 cm diameter) percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage Bare.Ground Bare ground percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage Rock Rock percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage Water Water percent cover recorded in increments of Trace (T, <=1%), then in 5% increments thereafter. Total ground cover should sum to 100%, however, in cases where totals from the datasheets did not sum to 100 (likely do to recording error), this is noted in the ‘Notes’ column. Producer Defined NA No Data Producer defined Percentage Notes Describes instances where data are either missing or the total coverage does not sum to 100 (indicating potential recording error). Producer Defined NA No Data Producer defined Data missing indicates that values were missing from data sheets. When total cover does not sum to 100, this is noted here as ‘Total on datasheet adds up to XXX%’. CoverClassData_2021.csv Comma Separated Value (CSV) file containing data. Producer Defined Pool Upper Mississippi Navigation Pool. Pools included in this study were 4, 8, 13, 17, 22, 26, Open River, and La Grange Pool on the Illinois River Producer Defined LG La Grange Pool (Illinois River) Producer defined 17 Pool 17 Producer defined 8 Pool 8 Producer defined 26 Pool 26 Producer defined 22 Pool 22 Producer defined 4 Pool 4 Producer defined OR Open River Producer defined 13 Pool 13 Producer defined Plot.ID Unique within-pool identification number (duplicates exist between pools so for a truly unique identify Pool and PlotID must be used together) Producer Defined 1 110 Subplot Subplot identifier. Ten 0.5m x 0.5m square subplots were measured per plot. Producer Defined 1 10 Subplot.N.S Subplot location from plot center in either north or south direction expressed in meters Producer Defined NA No Data Producer defined Meters north or south from plot center Subplot.E.W Subplot location from plot center in either east or west direction expressed in meters Producer Defined NA No Data Producer defined Meters east or west from plot center Canopy.C. Percent cover of canopy trees (dominant and co-dominant trees) using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Subcanopy.SC. Percent cover of subcanopy trees (sapling cohort) using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Group1.C.SC. Combined percent cover of canopy and subcanopy trees together using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Understory.U. Percent cover of understory (combined cover estimate for woody seedlings and herbaceous) using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Group2.C.SC.U. Combined percent cover of canopy and subcanopy trees and the understory altogether using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Woody.Vines.V. Percent cover of woody vines using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Group3.C.SC.U.V. Combined percent cover of canopy and subcanopy trees, the understory, and woody vines altogether using the following incremental cover estimates: 0, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 0 100 Percentage Notes Additional information provided by field crew. Producer Defined NA No Data Producer defined Notes taken in the field. TreeData_1995_2021.csv Comma Separated Value (CSV) file containing data. Producer Defined Pool Upper Mississippi Navigation Pool. Pools included in this study were 4, 8, 13, 17, 22, 26, Open River, and La Grange Pool on the Illinois River Producer Defined LG La Grange Pool (Illinois River) Producer defined 17 Pool 17 Producer defined 8 Pool 8 Producer defined 26 Pool 26 Producer defined 22 Pool 22 Producer defined 4 Pool 4 Producer defined OR Open River Producer defined 13 Pool 13 Producer defined PlotID Unique within-pool identification number (duplicates exist between pools so for a truly unique identifier Pool and PlotID must be used together). ) . In 1995, a greater number of plots were sampled than were resampled in 2021. For this reason, there are a selection of plots for which we only have 1995 tree data. Producer Defined Plot identification number. Species Original code used corresponding to a species name. Largely consistent with USDA PLANTS database codes. Producer Defined NA No Data Producer defined Species abbreviation, often coinciding with USDA PLANTS code. However, in some cases codes deviate from this and are abbreviations of common names. Additionally, instances where field crews were less certain about the identity of a given tree have abbreviations preceded by a question mark. Species that could not be identified were coded as 'UNKNOWN'. DBH_cm Diameter at breast height (4.5 ft) in centimeters Producer Defined NA No Data Producer defined 1.7 236.3 centimeters Status Vigor status of tree Producer Defined NA No Data Producer defined S Stressed Producer defined V Vigorous/Healthy Producer defined FL Flood-killed Producer defined D Dead prior to flood Producer defined Tag_num Tree tag number Producer Defined NA No Data. Indicates that tree was not tagged. Producer defined Identification number on tree tag. Missing data are noted as ‘missing’. Distance Distance from plot center (meters) Producer Defined NA No Data. Indicates that tree was not tagged. Producer defined Distance from plot center in meters. Missing data are noted as ‘missing’. Azimuth Bearing relative to plot center Producer Defined NA No Data. Indicates that tree was not tagged. Producer defined Bearing relative to plot center. Missing data are noted as ‘missing’. Notes Additional information provided by field crew and issues noted when screening for data quality. Producer Defined NA No Data Producer defined Notes taken in the field. Additionally, notes were added here to flag instances where species identification in the field was less certain (field crews in 1995 indicated this by preceding the species codes with a question mark). usda_code Code from the USDA PLANTS database corresponding to a species name Producer Defined NA No Data/Data missing Producer defined Code from the USDA PLANTS database corresponding to species. When no trees were present within plot, this was noted with ‘NO VEG’. When species identity was unknown, this was noted as ‘UNK’. Year Year sampled Producer Defined << empty cell >> No Data Producer defined 1995 2021 Year WoodySeedlingData_2021_below4.5ft.csv Comma Separated Value (CSV) file containing data. Producer Defined Pool Upper Mississippi Navigation Pool. Pools included in this study were 4, 8, 13, 17, 22, 26, Open River, and La Grange Pool on the Illinois River Producer Defined LG La Grange Pool (Illinois River) Producer defined 17 Pool 17 Producer defined 8 Pool 8 Producer defined 26 Pool 26 Producer defined 22 Pool 22 Producer defined 4 Pool 4 Producer defined OR Open River Producer defined 13 Pool 13 Producer defined Plot Unique within-pool identification number (duplicates exist between pools so for a truly unique identify Pool and PlotID must be used together) Producer Defined 1 110 Subplot.# Subplot identifier. Ten 0.5m x 0.5m square subplots were measured per plot. Producer Defined 1 10 Species Original code used corresponding to a species name. Largely consistent with USDA PLANTS database codes. Producer Defined Species name. When identity could not be determined this was noted as 'UNKNOWN'. When no seedlings were present within the subplot, this was noted as 'NONE'. Height.Class Height category recorded in 1 ft increments Producer Defined 0 4 Stem.Count Number of seedling stems in subplot Producer Defined 0 102 Cover.(%) Percent cover of seedling estimated by species and 1 foot height interval in incremental cover estimates of 0, T, 5, 25, 50, 75, 95, 100 Producer Defined NA No Data Producer defined 5 1-5% cover Producer defined 25 6-25% cover Producer defined 50 26-50% cover Producer defined 75 51-75% cover Producer defined T Trace (<1%) Producer defined 100 96-100% cover Producer defined 95 76-95% cover Producer defined 0 0% cover Producer defined Age Estimated seedling age in years Producer Defined NA No Data Producer defined Estimated seedling age in years. Notes Additional information provided by field crew. Producer Defined NA No Data Producer defined Notes made in the field usda_code Code from the USDA PLANTS database corresponding to a species name Producer Defined Code from the USDA PLANTS database corresponding to species. When identity could not be determined, this was noted as 'UNK'. When no seedlings were present in the subplot, this was noted as 'NO VEG'. GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P13DMXPN None 20250711 Shelby Weiss National Great Rivers Research and Education Center mailing and physical

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East Alton Illinois 62024 United States 618-468-2834 saweiss@lc.edu FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999