Data Type Name Description Category Notes Column Header Study_Population Polulation of lakes All_Lakes | Large_Lakes See'Study_Population' descriptions below Column Header Type Population estimate groups National|Lake_Origin|Misissippi_River_Basin|EPA_Region|AG_ECO3 | AG_ECO9 See 'Population estimate group' descriptions below Column Header Subpopulation Subpopulation estimate groups (subsets of the Type) CPL | EHIGH | MAN_MADE | MISSISSIPPI_BASIN |NAP | National | NATURAL | NOT_MISSISSIPPI_BASIN | NPL | PLNLOW | Region_01 | Region_02 | Region_03 | Region_04 | Region_05 | Region_06 | Region_07 | Region_08 | Region_09 | Region_10 | SAP | SPL | TPL | UMW | WMT | WMTNS | XER Column Header Indicator Indicator assessed ACID_COND | DIS_O2_CLS | PTL_COND | NTL_COND | CHLA_COND | TROPHIC_STATE |ATZ_EPA_COND_3.4 | ATZ_DETECT | CYLSPER_EPA_COND|CYLSPER_DETECT | MICX_EPA_COND | MICX_DETECT | ECOLI_EPA_COND | ECOLI_DETECT | BENT_MMI_COND_2017 | ZOOP_MMI_COND_2017 | DRAWDOWN_COND_2CAT_2017 | LITRIPCVR_COND|LITCVR_COND | RVEG_COND | RDIS_COND | NLA_SCI_STATUS| See 'Indicator' descritpions below Column Header Category "Condition category (e.g., good, fair, poor)" Above Benchmark | At or Below Benchmark |Detected | Eutrophic | Fair | Good | High (>= 5 ppm) | Hypereutrophic | Large | Least Disturbed | Low (<= 3 ppm) | Medium | Mesotrophic | Moderate (> 3 - < 5 ppm) | Not Assessed | Not Detected | Not Large | Oligotrophic | Poor | Small See NLA 2022 Technical Support Document for more details Column Header NResp "Number of ""responses""/sites in the category from the National Lakes Assessment 2022" NA Column Header Estimate.P "National Lakes Assessment 2022 population estimate - proportion of lakes (e.g., percent)" NA Column Header StdError.P Standard error for the population estimate based on percentages. Multiply by 1.968 to develop upper and lower confidence limits. NA Column Header LCB95Pct.P Error Bar for condition assessment based on percentages-- Lower confidence bound at 95% NA Column Header UCB95Pct.P Error Bar for condition assessment based on percentages--Upper confidence bound at 95% NA Column Header Estimate.U "Population Estimate, based on number of lakes for National Lakes Assessment 2022 data" NA Column Header StdError.U Standard error for the population estimate based on number of lakes NA Column Header LCB95Pct.U Error Bar for condition assessment based on based on number of lakes -- Lower confidence bound at 95% NA Column Header UCB95Pct.U Error Bar for condition assessment based on based on number of lakes --Upper confidence bound at 95% NA Column Header MarginofError.P margin of error of proportion estimate NA Column Header MarginofError.U margin of error of total estimate NA Indicator ACID_COND Acidity condition class NA Indicator ATZ_DETECT Atrazine Detection NA Indicator ATZ_EPA_COND_3.4 Condition based on Atrazine concentration and 3.4 ppb benchmark NA Indicator BENT_MMI_COND_2017 Condition class based on 2017 updated benthic MMI scores NA Indicator CHLA_COND "Condition for Chlorophyll a indicator, based on CHLX" NA Indicator CYLSPER_DETECT Cylindrospermopsin Detection NA Indicator CYLSPER_EPA_COND Cylindrospermopsin condition based on EPA benchmark NA Indicator DIS_O2_CLS Dissolved oxygen condition class NA Indicator DRAWDOWN_COND Drawdown condition NA Indicator DRAWDOWN_COND_2CAT_2017 "Drawdown condition, specifially for 2017 survey" NA Indicator ENT_1X_STV_COND Enterococci condition based on EPA benchmark NA Indicator LITCVR_COND Shallow water habitat condition class NA Indicator LITRIPCVR_COND Lake habitat complexity condition class NA Indicator MICX_DETECT Microcystin Detection NA Indicator MICX_EPA_COND Microcystin condition based on EPA benchmark NA Indicator NTL_COND Condition class based on total nitrogen NA Indicator PTL_COND Condition class based on total phosphorus NA Indicator RDIS_COND Lakeshore disturbance condition class NA Indicator RVEG_COND Riparian vegetation condition class NA Indicator TROPHIC_STATE Trophic state (Oligotrophic/Mesotrophic/Eutrophic/Hypereutrophic) NA Indicator ZOOP_MMI_COND_2017 Condition class based on 2017 updated zooplankton MMI scores (following tow volume corrections) NA Population estimate groups AG_ECO3 "NARS 3-level reporting region (2015), based on aggregating AGGR_ECO9_2015 reporting regions. No missing values allowed." EHIGH|PLNLOW|WMTNS| Population estimate groups AG_ECO9 "NARS 9-level reporting region (2015), based on aggregated Omernik Level III ecoregions. No missing values allowed." CPL|NAP|NPL|SAP|SPL|TPL|UMW|WMT|XER| Population estimate groups EPA_Region EPA Region. No missing values allowed. Region_01|Region_02|Region_03|Region_04|Region_05|Region_06|Region_07|Region_08|Region_09|Region_10| Population estimate groups Lake_Origin "Lake origin, based on evaluation on map or in field" MAN_MADE|NATURAL|UNCERTAIN|UNKNOWN Population estimate groups Misissippi_River_Basin "Within Mississippi Basin or outside, based on MAJ_BAS_NM values" MISSISSIPPI_BASIN|NOT_MISSISSIPPI_BASIN Population estimate groups National Conterminous United States NA Study Population Large_Lakes Lakes greater than or equal to 4 hectacres (ha) in surface area Study Population All_Lakes Lakes greater than or equal to 1 hectacre (ha) in surface area