Modeling water quality effects of structural and operational changes to Scoggins Dam and Henry Hagg Lake, Oregon
Scientific Investigations Report
2006-5060
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Abstract
To meet water quality targets and the municipal and industrial water needs of a growing population in the Tualatin River Basin in northwestern Oregon, an expansion of Henry Hagg Lake is under consideration. Hagg Lake is the basin's primary storage reservoir and provides water during western Oregon's typically dry summers. Potential modifications include raising the dam height by 6.1 meters (20 feet), 7.6 meters (25 feet), or 12.2 meters (40 feet); installing additional outlets (possibly including a selective withdrawal tower); and adding additional inflows to provide greater reliability of filling the enlarged reservoir. One method of providing additional inflows is to route water from the upper Tualatin River through a tunnel and into Sain Creek, a tributary to the lake. Another option is to pump water from the Tualatin River (downstream of the lake) uphill and into the reservoir during the winter--the 'pump-back' option. A calibrated CE-QUAL-W2 model of Henry Hagg Lake's hydrodynamics, temperature, and water quality was used to examine the effect of these proposed changes on water quality in the lake and downstream. Most model scenarios were run with the calibrated model for 2002, a typical water year; a few scenarios were run for 2001, a drought year. More...
Suggested Citation
Sullivan, A.B., Rounds, S.A., 2006, Modeling water quality effects of structural and operational changes to Scoggins Dam and Henry Hagg Lake, Oregon: U.S. Geological Survey Scientific Investigations Report 2006-5060, vi, 36 p., https://doi.org/10.3133/sir20065060.
ISSN: 2328-0328 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Modeling water quality effects of structural and operational changes to Scoggins Dam and Henry Hagg Lake, Oregon |
| Series title | Scientific Investigations Report |
| Series number | 2006-5060 |
| DOI | 10.3133/sir20065060 |
| Year Published | 2006 |
| Language | ENGLISH |
| Contributing office(s) | Oregon Water Science Center |
| Description | vi, 36 p. |