Glenn-Colusa Irrigation District

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Glenn-Colusa Irrigation District Dedicated to providing reliable, affordable water supplies to its water users, while ensuring the environmental and economic viability of the region.

HISTORY

The District’s appropriative water rights began on the Sacramento River with an 1883 filing posted on a tree by Will S. Green, surveyor, newspaperman, public official, and pioneer irrigator. His first claim was for 500,000 miner’s inches under 4 inches of pressure and was one of the earliest and largest water rights on the Sacramento River. GCID was organized in 1920, after several private companies failed financially, and a group of landowners reorganized and refinanced the irrigation district, retaining claim to Green’s historic water right. The disastrous rice crop failure of 1920–21 nearly destroyed the district at its inception, and the “great depression” took a further toll, making it necessary for the district to refinance in the 1930s. Additionally, the United States purchased lands within GCID during this period, which would later become three federal refuges totaling approximately 21,000 acres. GCID TODAY

Today, GCID is the largest irrigation district in the Sacramento Valley. The district boundaries cover approximately 175,000 acres; of which approximately 140,000 farmed. There are 1,076 landowners in the District and an additional 200 tenant water users. Additionally, GCID services 1,200 acres of private habitat land and 21,000 acres of protected federal wildlife refuges. Winter water supplied by GCID to thousands of acres of rice land provides valuable habitat for migrating waterfowl during the winter months. GCID’s main pump station, its only diversion from the Sacramento River, is located near Hamilton City. The District’s 65-mile long Main Canal conveys water into a complex system of nearly 1,000 miles of canals, laterals and drains, much of it constructed in the early 1900s. GCID has a deep commitment to sustainable practices – both in managing the water supply, as well as preserving and protecting the environment, fish and wildlife in the region. The District has completed numerous projects to ensure minimal impact of water diversion on fish and wildlife, as well as deliver water to maintain critical wildlife habitat. The District headquarters are located in Willows, the county seat of Glenn County, approximately 90 miles north of Sacramento on Interstate 5. A five-member board of directors governs the District. The annual budget is $15 million. WATER SUPPLY

Current water supplies are diverted under the “Settlement Water Contracts” with the Bureau of Reclamation (Bureau). The first Settlement Contracts were established in 1964 to allow the Bureau to operate and divert water for the newly constructed Central Valley Project. The contract was renewed for another 40-year term in 2005. The contract provides GCID with water supply for the months of April through October for 720,000 acre-feet of base supply, and 105,000 acre-feet of Central Valley Project water that is purchased during the months of July and August. During a designated critical year when natural inflow to Shasta Reservoir is less than 3.2 million acre-feet, GCID’s total supply is reduced by 25%, to a total of 618,000 acre-feet. Additionally, the District has rights under a State Water Resources Control Board (SWRCB) permit to “winter water.” These rights run from November 1 through March 31 at a 1,200 cubic feet per second (cfs) diversion rate. This water supply is used for rice straw decomposition and waterfowl habitat. Looking ahead, GCID will remain focused on continuing to deliver a sustainable, reliable water supply by positioning itself to respond proactively, strategically and responsibly to California’s ever-changing water landscape.

💧 September at GCID: Harvest Changes Water DemandFrom almond orchards to rice and tomato fields, September is a busy tim...
09/15/2026

💧 September at GCID: Harvest Changes Water Demand
From almond orchards to rice and tomato fields, September is a busy time for agriculture throughout the District.
As almonds and tomatoes are harvested and rice fields finish their final irrigation, water needs begin to decrease in different parts of GCID’s service area.
Water demand doesn’t stop everywhere at once. GCID Water Operations continually monitors the system and adjusts diversions and canal flows as individual water users and areas finish irrigating for the season.
It’s a gradual transition that happens every fall as harvest moves across the District.

September at GCID: Harvest Season Is HereSeptember brings a noticeable change across Glenn-Colusa Irrigation District as...
09/08/2026

September at GCID: Harvest Season Is Here
September brings a noticeable change across Glenn-Colusa Irrigation District as harvest activity picks up.
Almond harvest is underway, with shakers, sweepers and harvest equipment moving through local orchards. At the same time, rice fields are approaching harvest, and irrigation needs are beginning to change across the District.
As crops finish their irrigation cycles, GCID Water Operations monitors changing water demands and adjusts canal flows throughout the system.
Harvest season marks the beginning of an important transition at GCID — from peak summer irrigation toward fall maintenance and winter operations.

THEN & NOW | GCID Main Pump Station rehabilitated in 1984Different equipment. Same important job.In 1984, GCID completed...
09/03/2026

THEN & NOW | GCID Main Pump Station rehabilitated in 1984
Different equipment. Same important job.

In 1984, GCID completed a major rehabilitation of the Main Pump Station near Hamilton City, replacing the original pumping equipment with the system that continues to serve as the heart of District water operations today. The Main Pump Station was part of a major rehabilitation program. District landowners had approved a $17 million Bureau of Reclamation loan in 1980 to rehabilitate GCID facilities, including the Main Pump Station and Main Canal, and GCID contributed another $4 million from District reserves toward its broader Master Water Plan.

The rebuilt Pump Station included 10 pumps with a combined capacity of approximately 3,000 cubic feet per second, providing GCID with the ability to reliably divert Sacramento River water into the Main Canal for delivery throughout the District.

More than 30 years later, beginning in 2016, GCID once again began investing in this critical infrastructure, undertaking a multi-year program to refurbish the pumps and motors as they reached the end of their expected service life.

From the original pumping equipment to the major 1984 rehabilitation and today's continued modernization, the Main Pump Station represents generations of investment in reliable water delivery for GCID water users.

Glenn-Colusa Irrigation District will be closed Monday, September 7, 2026, in observance of Labor Day.GCID will reopen f...
09/03/2026

Glenn-Colusa Irrigation District will be closed Monday, September 7, 2026, in observance of Labor Day.

GCID will reopen for regular business on Tuesday, September 8, 2026.

Glenn-Colusa ID wishes everyone a safe and enjoyable Labor Day!

Happy 4th of July! 🇺🇸As we celebrate 250 years of American independence, we wish everyone an enjoyable Independence Day ...
07/01/2026

Happy 4th of July! 🇺🇸

As we celebrate 250 years of American independence, we wish everyone an enjoyable Independence Day with family and friends.

GCID offices will be closed on Friday, July 3, in observance of Independence Day.

Emergency calls will continue to be received by the GCID answering service and forwarded to the appropriate personnel.

Have a wonderful Holiday!

Welcome Julian Garcia Valdez & Miguel Rodriguez to GCID!Please join us in welcoming Julian Garcia Valdez and Miguel Rodr...
06/11/2026

Welcome Julian Garcia Valdez & Miguel Rodriguez to GCID!

Please join us in welcoming Julian Garcia Valdez and Miguel Rodriguez to the Glenn-Colusa Irrigation District team. Both have joined the Abatement/Canal Road Maintenance Department and will be helping maintain District roads, vegetation management, and related field operations throughout the system.

We are excited to have Julian and Miguel on board and look forward to their contributions. If you see them out in the field, be sure to give them a warm welcome! 🚜🌱

🌞Welcome Summer Water Interns! 🌞GCID welcomes Summer Water Interns Elizabeth Peña and Ryan Chapman. Elizabeth is a recen...
06/10/2026

🌞Welcome Summer Water Interns! 🌞

GCID welcomes Summer Water Interns Elizabeth Peña and Ryan Chapman.

Elizabeth is a recent U.C. Davis graduate interested in California water resources, and Ryan is a local resident and the son of GCID Abatement Department member Loren Chapman.

Through July, Elizabeth and Ryan will be in the fields reading water meters and taking measurements at turnouts throughout the District. Their work will supplement the routine measurements performed by the Water Operators and help increase data collection efforts to ensure accuracy, identify potential system issues and improve water distribution.

If you see Elizabeth and Ryan out in the fields this summer, please take a moment to say hello and welcome them to GCID! 👋💧

GCID is pleased to welcome Gavin Shelton and Danny Sosa to the team as the newest members of the Water Department.We are...
06/09/2026

GCID is pleased to welcome Gavin Shelton and Danny Sosa to the team as the newest members of the Water Department.

We are excited to have them on board and look forward to the knowledge, dedication, and hard work they will bring to the District. Please join us in welcoming Gavin and Danny to the GCID family!

03/02/2026

Address

344 East Laurel Street
Willows, CA
95988

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

(530) 934-8881

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