Record Display for the EPA National Library Catalog


Main Title A GIS inventory of Pacific Northwest lakes/reservoirs and an analysis of historical nutrient and water quality data /
Author Vaga, Ralph M. ; Vaga, R. M. ; Herlihy, A. T.
Other Authors
Author Title of a Work
Herlihy, A. T.
CORP Author Environmental Protection Agency, Seattle, WA. Region X. ;Oregon State Univ., Corvallis. Dept. of Fisheries and Wildlife.
Publisher U.S. Environmental Protection Agency, Region 10,
Year Published 2004
Report Number EPA 910-R-04-009
Stock Number PB2006-115540
OCLC Number 59723398
Subjects Water quality--Northwest, Pacific ; Lakes--Northwest, Pacific ; Reservoirs--Northwest, Pacific ; Pacific Northwest
Additional Subjects Geographic information system ; Lakes ; Reservoirs ; Water quality ; Nutrients ; Phosphorus ; Nitrogen ; Chlorophyll ; Inventories ; Historical data ; Pacific Northwest ; Idaho ; Oregon ; Washington(State) ; Ecoregions
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 910-R-04-009 Headquarters Library/Washington,DC 10/23/2018
ESAD  EPA 910-R-04-009 2 copies Region 10 Library/Seattle,WA 06/10/2016
NTIS  PB2006-115540 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation iv, 68 pages : illustrations, maps ; 28 cm
Lakes and reservoirs were inventoried in the Pacific Northwest (Idaho, Oregon and Washington) to determine the number and location of these water bodies in the region. GIS data were obtained from various sources and combined into a single data layer. The lakes on the layer were verified against maps for water bodies equal to 4 ha. Results show that there are approximately 10,535 lakes/reservoirs in the PNW that have been assigned names. There are 3965 lakes/reservoirs equal to 4 ha in surface area in this region. About 90% of these lakes are less than 200 ha and fully one-half (n=1985) are less than 10 ha. A water quality database was compiled from various sources for lakes in the region. The data were screened and May - October medians (summer index values) calculated for total phosphorus, total nitrogen, Secchi depth and chlorophyll a. The behavior of these variables was analyzed across Level III Ecoregions.
Prepared for U.S. Environmental Protection Agency, Region 10, Office of Water and Watersheds. "EPA 910-R-04-009." "November 2004."