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	Index chemistry sample for site (YES/NO)-typically the Visit 1 Primary sample	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	SAMPLED_CHLA	CHLA SAMPLE COLLECTED/ANALYZED?	2	20
40	INDXSAMP_CHLA	Index chlorophyll sample for site (YES/NO)-typically the Visit 1 Primary sample	2	3
41	CHLA	Chlorophyll a concentration (µg/L).  Calculated as CHLA_ADJ*(40/VOL_FILTERED)	1	
42	SAMPLED_SECCHI	Secchi Depth Site Sample Status	2	24
43	SECMEAN	Secchi transparency (m)(=avg. of disk disappearance and reappearance depths)	1	
44	CLEAR_TO_BOTTOM	Clear all the way to the bottom (Y/blank)	2	4
45	TSTATE_TP	"TROPHIC STATE BASED ON TOTAL P (10, 25, 50 ug/L)"	2	30
46	TSTATE_TN	"TROPHIC STATE BASED ON TOTAL N (0.35, 0.75, 1.4 mg/L)"	2	30
47	TSTATE_CHL	"TROPHIC STATE BASED ON CHL A (2, 7, 30 ug/L)"	2	30
48	TSTATE_SECCHI	"TROPHIC STATE BASED ON SECCHI TRANSPARENCY (4, 2.1, 0.7 m)"	2	30
