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OLS Field Name OLS Field Data
Main Title An approach to a relative trophic index system for classifying lakes and reservoirs : a preliminary anaysis of National Eutrophication Survey Data collected during the 1972 sampling period.
CORP Author Pacific Northwest Environmental Research Lab., Corvallis, Oreg.;National Environmental Research Center, Las Vegas, Nev.
Publisher Pacific Northwest Environmental Research Laboratory,
Year Published 1974
Report Number EPA 910-R-74-107; EPA 645-R-74-001; Working Paper-24
Stock Number PB-242 336
OCLC Number 13355690
Subjects Eutrophication--United States. ; Lake ecology--United States.
Additional Subjects National Eutrophication Survey. ; Lakes ; Reservoirs ; Limnology ; Water quality ; Classifications ; Surveys ; Indexes(Documentation) ; Tables(Data) ; Trophic level ; Oligotrophy ; Mesotrophy ; Eutrophy
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJAM  QH96.8.E9A652 Region 3 Library/Philadelphia, PA 08/25/2006 DISPERSAL
EJBD ARCHIVE EPA 645-R-74-001 Headquarters Library/Washington,DC 04/04/2013
EJBD  EPA 645-R-74-001 Headquarters Library/Washington,DC 12/09/2016
ELBD RPS EPA 645-R-74-001 repository copy AWBERC Library/Cincinnati,OH 10/27/2020
ESAD  EPA 910-R-74-107 Region 10 Library/Seattle,WA 09/24/2012
ESBD  EP1.2 NERC-CO NES WP-24 CPHEA/PESD Library/Corvallis,OR 09/29/1995 DISPERSAL
NTIS  PB-242 336 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 44 pages ; 28 cm
Abstract A relative trophic state index for lake classification was developed using six key water quality parameters. The data base was approximately 200 lakes and reservoirs in northeast and north central United States which had been included in the National Eutrophication Survey during 1972-73. Each lake was given an index number and was also classified according to the conventional terminology of oligotrophic, mesotrophic, and eutrophic. The method can be used to classify a lake of unknown trophic condition if the proper parameters have been measured.
Notes "Working paper no. 24." "PB-242 336." Print reproduction.
Place Published Corvallis, Ore.
Corporate Au Added Ent United States. Environmental Protection Agency.
NTIS Title Notes Preliminary rept.
PUB Date Free Form 1974
Series Title Traced Working paper / National Eutrophication Survey ;
Category Codes 08H; 13B; 48G; 68D
NTIS Prices PC A03/MF A01
BIB Level m
Medium unmediated
Content text
Cataloging Source OCLC/T
Control Number 326605669
OCLC Time Stamp 20201020054853
Language eng
Origin OCLC
OCLC Rec Leader 01536cam 2200409Ia 45010