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Title: Water Quality Trends in the Entiat River Subbasin: Final 2008 Annual Report.

The ISEMP program monitors the status and trend of water quality elements that may affect restoration project effectiveness in the Entiat subbasin. As part of this effort, the PNW Research Station (PNW) measures, analyzes and interprets temporal trends in natural stream water pH, dissolved oxygen, specific conductivity and temperature. The Entiat River is currently on the Clean Water Act 303(d) list for pH exceedence, and there is insufficient information to determine the spatial and temporal extent or potential causes of this exceedence. In the spring 2008, PNW redeployed data-logging, multiparameter probes at four locations in the Entiat subbasin to measure water quality parameters, focusing on pH. This resumed previous data collection that was interrupted by river ice in early December 2007. Instruments were again removed from the river in early December 2008. This annual report covers the period from December 2007 through December 2008. The highest pH values occurred during the low-flow period from midsummer through the following midspring then dropped sharply during the annual snowmelt runoff period from late spring through early summer. Water temperature began rapidly increasing during the receding limb of the annual snowmelt hydrograph. Highest mean monthly temperatures occurred in July and August, while instantaneous maximamore » occurred during the period July-September. Dissolved oxygen reached its lowest levels during the period of highest water temperature in July-September. Specific conductivity remained very low at all sites throughout the year.« less
Authors:
;  [1]
  1. PNW Research Station, USDA Forest Service, Wenatchee, WA
Publication Date:
OSTI Identifier:
962204
Report Number(s):
P111125
R&D Project: 2003-017-00; TRN: US200916%%223
DOE Contract Number:
37005
Resource Type:
Technical Report
Resource Relation:
Related Information: document dated March 16, 2009 Project Title: Integrated Status and Effectiveness Monitoring Program.
Research Org:
Bonneville Power Administration (BPA), Portland, OR (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; CLEAN WATER ACTS; DISSOLVED GASES; FOCUSING; MONITORS; OXYGEN; PH VALUE; PROBES; RIVERS; RUNOFF; WATER; WATER QUALITY