VARNUM NAME LABEL TYPE LENGTH 1 SITE_ID ID assigned to each site 2 25 2 VISIT_NO Sequential visit number within year 1 3 SITE_TYPE PROB_Samp: Lake is from probability sample and can be used for population estimation. REF_Lake: Lake is not from probability sample and was selected as a candidate reference lake 2 10 4 LAKE_SAMP "Eval. status. _Denied (access denied). _Inaccess (physically inaccessible). _Other. _LT_4ha (< 4ha). _Shallow (< 1m deep). _Vegetated (< 1000 m2 open H2O). _Saline (tidal). Special_Purpose (aquacult., disposal, WWT, or evap.). Not_Lake (other)" 2 20 5 TNT Target:Non-target evaluation status derived from LAKE_SAMP 2 10 6 LAT_DD Latitude (decimal degrees) obtained from NHD (NAD83) 1 7 LON_DD Longitude (decimal degrees) obtained from NHD (NAD83) 1 8 ST State two letter code 2 2 9 EPA_REG EPA Region 2 9 10 AREA_CAT7 Lake area unequal probability category (7 categories) 2 10 11 NESLAKE NESLake-Lake was included in 1970s National Eutrophication Survey 2 7 12 STRATUM Probability survey design stratum. NLALake is single stratum 2 8 13 PANEL Panel_1-lake was included in base design. OverSamp-Lake was part of over sample of lakes used for replacing lakes in base design if they could not be sampled 2 8 14 DSGN_CAT Probability survey design categories used to assign unequal probability of selection 2 15 15 MDCATY Unequal selection probability for lake 1 16 WGT Initial site weight based on base design. DO NOT USE for population estimation 1 17 WGT_NLA Adjusted site weight. USE for population estimation 1 18 ADJWGT_CAT Categories used to adjust initial design weight (WGT) to account for use of over sample lakes. 2 5 19 URBAN URBAN LAKE? (YES/NO) 2 3 20 WSA_ECO3 Wadeable Stream Assessment three aggregrated Omernik level 3 ecoregions 2 6 21 WSA_ECO9 Wadeable Stream Assessment nine aggregrated Omernik level 3 ecoregions 2 3 22 ECO_LEV_3 Omernik level 3 ecoregion number 2 2 23 NUT_REG "Nutrient ecoregion, based on EPA nutrient criteria documents for lakes & reservoirs)" 2 4 24 NUTREG_NAME Nutrient ecoregion name 2 60 25 ECO_NUTA NLA Aggregate Nutrient Ecoregion 2 5 26 LAKE_ORIGIN "Lake origin (MAN-MADE, NATURAL [which includes natural lakes augmented by dams])" 2 9 27 ECO3_X_ORIGIN WSA_ECO3 x LAKE_ORIGIN CLASS 2 20 28 REF_CLUSTER NLA Reference Site Cluster (A-G) 2 1 29 RT_NLA "NLA Reference Class Assignment (REF=reference, SO-SO=intermediate, TRASH=impacted)" 2 8 30 HUC_2 Hydrologic region (2-digit) 2 2 31 HUC_8 Hydrologic region (8-digit) 2 8 32 FLAG_INFO Data qualifier flag for lake info data 2 12 33 COMMENT_INFO Comments and flag explanations for lake info data 2 160 34 SAMPLED Site Sampled Code 2 30 35 SAMPLED_CHEM Site Sampled Code for Water Chemistry Data 2 20 36 INDXSAMP_CHEM Index chhemistry sample for site (YES/NO)-typically the Visit 1 Primary sample 2 3 37 PTL Total Phosphorus (ug/L) 1 38 NTL Total Nitrogen (ug/L) 1 39 TURB Turbidity (NTU) 1 40 ANC Gran ANC (ueq/L) 1 41 DOC Dissolved Organic Carbon (mg/L) 1 42 COND Conductivity (uS/cm @ 25 C) 1 43 SAMPLED_CHLA CHLA SAMPLE COLLECTED/ANALYZED? 2 20 44 INDXSAMP_CHLA Index chlorophyll sample for site (YES/NO)-typically the Visit 1 Primary sample 2 3 45 CHLA Chlorophyll a concentration (µg/L). Calculated as CHLA_ADJ*(40/VOL_FILTERED) 1 46 PTL_COND NUTRIENT CONDITION CLASS (TOTAL P) 2 30 47 NTL_COND NUTRIENT CONDITION CLASS (TOTAL N) 2 30 48 CHLA_COND CONDITION CLASS (CHLOROPHYLL A) 2 30 49 TURB_COND CONDITION CLASS (TURBIDITY) 2 30 50 ANC_COND CHEMICAL CONDITION CLASS (ANC) 2 30 51 SALINITY_COND CHEMICAL CONDITION CLASS (Conductivity/Salinity) 2 30