Potter Valley Irrigation District Logo

Supporting sustainable food, power, and water for over 100 years

In 1908, a hydroelectric plant was built on the north end of Potter Valley, replacing a coal-fired plant to power the city of Ukiah. Today, roughly 3% of the Eel River watershed is diverted to the Russian River to run the turbines.

Potter Valley Irrigation District provides agricultural water for Potter Valley, in Mendocino County, California, using a portion of the water diverted through the power plant. Potter Valley's family farms produce wine grapes, pears, grass-fed cattle, sheep and other agricultural products valued at over $34 million.

cattle crossingThe Great Green Pumpkin
Barn
Pear Trees in Potter Valley, April 2015
Pear Trees in Potter Valley, April 2015

Water Rate Increase

The contract price that Potter Valley Irrigation District (PVID) pays to Pacific Gas and Electric (PG&E) has recently been renegotiated, which will cause a rise in water rates. A letter with the new rates has been sent out to all customers.

Groundwater 101

On Wednesday, May 20, 2015, the Mendocino County Water Agency and the University of California Cooperative Extension Service will hold an educational forum on groundwater at 5:30 pm in the Board of Supervisors Chambers. The speaker will be Thomas Harter, a hydrologist with UC Davis. Members of the public are encouraged to attend and will have the opportunity to ask questions. More information

New Documents

Check out our new interactive map of the Eel River watershed. It includes major and minor watershed boundaries, USGS stream gauges, popups with pictures and data at points of interest, and major peaks overlaid on a satellite image.

The PVID Documents & Data page collects scientific papers, government reports, regulatory documents, and other relevant data and information for the Eel River and Russian River systems. In some cases, we have scanned or acquired papers that were not previously available in electronic format to make them available here, such as Kubicek, P.F. 1977., which is a key study of Eel River summer temperatures.

Potter Valley Project 2012 Block Water Releases & Guidelines (12 MB PDF) is from a July 30, 2012 presentation to the Eel-Russian River Commission Meeting by Dick Butler and Jeffery Jahn of NMFS. This is an excellent discussion of the use of Lake Pillsbury block water and considerations used to determine whether proposed water releases are appropriate and beneficial to fish.

Potter Valley Project Block Water Request 2014 - NMFS/CDFW press release discussing their 2014 block water request of 2,085 acre-feet for the purpose of lowering and monitoring the water temperature from Lake Pillsbury to Outlet Creek to protect juvenile steelhead from August 15 through October 11. The release will be closely monitored to determine its effectiveness and also to inform future models of the system.

C. Hypotheses and Effectiveness Monitoring

This blockwater release will test the following hypotheses:

  1. Increased releases from Lake Pillsbury through the Scott Dam needle valve will increase the extent of the optimal coldwater rearing zone (≤ 20°C) between Scott and Cape Horn dams.
  2. Increased releases from Lake Pillsbury through the Scott Dam needle valve will decrease water temperature and increase habitat availability (using flow as indicator) downstream of Cape Horn Dam to Tomki Creek.
  3. Sufficient reservoir storage will sustain a coldwater pool that effectively maintains favorable steelhead temperature-dependent interaction conditions between Scott and Cape Horn dams.

The following data will be gathered to test these hypotheses:

The latest Russian River frost water regulation decision (2.7 MB PDF) was reached on 9/26/12. The State Water Resources Control Board's Section 862 frost water regulation on the Russian River was judged an improper exercise of the Board's authority. The Findings of Fact contains a substantial narrative discussing frost protection in the Russian River watershed and the use of water for this purpose. While these frost water regulations excluded Potter Valley, it is worth reading the narrative to get a better understanding of water issues on the Russian River system.

We've created a new interactive graph of Van Arsdale Fish Counts showing all historical data from VAFS starting in 1933. You can also download the raw data in CSV form, if you wish. The graph makes it easy to compare the counts of the different species and to see how counts have changed over the years.

potter valley panorama