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Sonoma County Water Agency: Overview of Russian River Water Flows

Sonoma County Water Agency: Overview of Russian River Water Flows. March 5, 2013 Don Seymour, P.E. Russian River Watershed. Lake Pillsbury. Facilities – Wohler/Mirabel. Lake Sonoma. Lake Mendocino. State Water Resources Control Board Decision 1610.

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Sonoma County Water Agency: Overview of Russian River Water Flows

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  1. Sonoma County Water Agency: Overview of Russian River Water Flows • March 5, 2013 Don Seymour, P.E.

  2. Russian River Watershed Lake Pillsbury • Facilities – Wohler/Mirabel • Lake Sonoma • Lake Mendocino

  3. State Water Resources Control Board Decision 1610 • Adopted April 1986, 15 days of Public hearings: 1984-1985 • Authorizes Agency to divert/redivert up to 75,000 afy • Sets water year classification based on inflow to PG&E's Lake Pillsbury (not Russian River watershed) • Sets minimum river flow requirements (based on water year classification) • Developed before ESA listing Eel & Russian River fish species • Reserved jurisdiction to change minimum flow requirements based on information from additional fishery studies or changes to PG&E’s PVP FERC License.

  4. Jan to Mar 150 CFS If combines storage in Lake Pillsbury and Lake Mendocino on May 31 is: <130,000 AF or <80% of water supply storage capacity, whichever is less Jun to Dec 75 CFS 130,000-150,000 AF or 80-90% of water supply storage capacity, whichever is less Jun to Dec 150 CFS 150,000 AF or >90% of water supply storage capacity Jun to Aug 185 CFS Sept to Dec 150 CFS If Lake Mendocino <30,000 AF storage Oct to Dec 75 CFS Dry Critical 75 CFS 25CFS Decision 1610 Minimum In-stream Flows Russian River East Fork to Dry Creek Normal

  5. Jan to Apr 75 CFS May to Oct 80 CFS Nov to Dec 105 CFS Normal Apr to Oct 25 CFS Nov to Mar 75 CFS Dry Apr to Oct 25 CFS Nov to Mar 75 CFS Critical Decision 1610Minimum In-stream FlowsDry Creek - Warm Springs Dam to Russian River

  6. Normal 125 CFS Dry 85 CFS Critical 35 CFS Decision 1610 Minimum In-streamFlows Russian River Dry Creek to Pacific Ocean

  7. Endangered Species Act Compliance – Biological Opinion • Issued: September 2008 • Why: Three species of fish listed under federal ESA • Parties: US Army Corps of Engineers, Sonoma County Water Agency, and Mendocino County Flood Control • Considers: Impacts of current operations on listed fish • Timeline: 15 years to implement • Major findings: Operations (D1610 flows too high) jeopardize coho salmon and steelhead & adversely modifies their habitat; no jeopardy or adverse modification for Chinook salmon

  8. Jun to Aug: 185 CFS Sept to Oct: 150 CFS Jun to Oct: 125 CFS Desicision 1610 Biological Opinion Biological Opinion Changes toMinimum In-stream Flows Russian River East Fork to Dry Creek Normal

  9. Jan to Apr 75 CFS May to Oct 80 CFS Nov to Dec 105 CFS May to Oct: 40 CFS Biological Opinion Normal Biological OpinionChanges toMinimum In-stream FlowsDry Creek - Warm Springs Dam to Russian River

  10. Normal Biological Opinion 70 CFS (85 CFS w/ buffer) 125 CFS Biological Opionion Dry 85 CFS 70 CFS (85 CFS w/ buffer) Biological OpinionChanges toMinimum In-stream Flows Russian River Dry Creek to Pacific Ocean

  11. Healdsburg + Dry Creek Mouth Flows 1986 - 2012

  12. Riverfront Park Flows 2010 - 2012

  13. Russian River, Dry Creek to Riverfront Regional Park

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