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		
