Glenn-Colusa Irrigation District

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 priva

te 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.

03/02/2026
GCID 105th Anniversary Celebration "Perhaps you never saw a spot of earth so beautiful that the love of it would take yo...
09/11/2025

GCID 105th Anniversary Celebration
"Perhaps you never saw a spot of earth so beautiful that the love of it would take you from all the enchantment . . . There are but few men now living who saw the Sacramento Valley as I saw it." – Will S. Green circa 1883
General Manger Sutton welcomed guests to the Anniversary Celebration with a brief history of the District since its inception 105 years ago, and 142 years since Will S. Green’s historic water right posting. GCID stands as the largest irrigation district in Northern California. From the Main Pump Station and Fish Screen, GCID diverts from the Sacramento River to deliver irrigation water via the 65 mile long Main Canal and a complex system of over 430 miles of laterals. This irrigation system currently services over 1,200 family farms and approximately 140,000 acres of irrigated agricultural land in Colusa and Glenn Counties, providing the lifeblood to our farms - the primary economic driver for our regional economy. Additionally, the District wheels water on behalf of the Central Valley Project to serve over 20,000 acres of wildlife refuges lands (consisting of the Sacramento, Delevan, and Colusa National Wildlife Refuges), providing important habitat for waterfowl, shore birds, and a multitude of terrestrial species.
Guest speakers included: Andrew Hitchings Somach Simmons & Dunn; David Guy NCWA; Brendan Leigh USBR; Teri Dubose Congressman LaMalfa representative; Juleah Cordi Assemblyman Gallagher representative; Breyden Coma Senator Dahle representative; and Sarah Joyce Spooner National Anthem

GCID is excited to welcome Nicole Enck to the team! Nicole is the new Accounting Specialist in the front office. Nicole ...
08/29/2025

GCID is excited to welcome Nicole Enck to the team! Nicole is the new Accounting Specialist in the front office. Nicole and her husband make their home in Orland. They have two sons, one granddaughter and one grandson. Stop by the office and say hello!

Application and detailed job description are available at the Glenn-Colusa Irrigation District office located at 344 E. ...
07/31/2025

Application and detailed job description are available at the Glenn-Colusa Irrigation District office located at 344 E. Laurel Street, Willows, CA 95988 or on the District’s website at https://www.gcid.net/careers/ .

GCID Welcomes Cristian Silva!GCID is pleased to welcome Cristian Silva to the team as the newest Water Operator! Cristia...
07/15/2025

GCID Welcomes Cristian Silva!

GCID is pleased to welcome Cristian Silva to the team as the newest Water Operator! Cristian and his wife Lluvia make their home in Colusa with their five-year-old son Keanu.

When he is not on the job, Cristian enjoys rugby and spending time with his family.

Welcome aboard Cristian, we’re glad to have you with us!

Glenn-Colusa Irrigation District is excited to welcome Brad Mattson as its new Assistant General Manager. With deep root...
07/07/2025

Glenn-Colusa Irrigation District is excited to welcome Brad Mattson as its new Assistant General Manager.

With deep roots in agriculture and a passion for water management, Mattson has built a career committed to serving farming communities and stewarding vital water resources. Raised in a rice farming family, and a fourth-generation rice farmer, he developed an early appreciation for the land and the critical role water plays in sustaining it.

“On behalf of the GCID Board, I wish to welcome Brad Mattson as our new Assistant General Manager. He has spent a career working in water and agriculture in the Sacramento Valley. He knows our region, he speaks our language, he is familiar with our issues, and he shares our values. I feel very fortunate to add an individual of Brad’s talent and experience to the GCID Leadership team,” said Logan Dennis, GCID Board President

Happy Independence Day! Please note that the GCID office will be closed on Friday, July 4 and will reopen Monday, July 7...
07/03/2025

Happy Independence Day!

Please note that the GCID office will be closed on Friday, July 4 and will reopen Monday, July 7 – enjoy your festivities!

Emergency calls will be answered by GCID’s answering service and forwarded to the appropriate personnel.

Glenn-Colusa Irrigation District is currently working closely with Rubicon Water on a one-year trial of their SlipMeter™...
06/11/2025

Glenn-Colusa Irrigation District is currently working closely with Rubicon Water on a one-year trial of their SlipMeter™ gate technology at the sublateral level. This cutting-edge solution is designed to enhance flow measurement accuracy and water delivery efficiency.

By piloting the SlipMeter at a sublateral turnout, GCID is taking another step toward modernizing the distribution system and supporting data-driven water management for the District and its Water Users.

Benefits:
🔹 Real-time flow data
🔹 Improved operational control and canal management
🔹 Enhanced service to our water users

GCID is excited to evaluate this technology’s potential to support precision agriculture and optimize water use across the District.

Welcome Brady Holzapfel!Brady will be working for GCID as a summer Engineering Intern. He is currently attending Oklahom...
05/28/2025

Welcome Brady Holzapfel!

Brady will be working for GCID as a summer Engineering Intern. He is currently attending Oklahoma State University, majoring in Biosystems Agricultural Engineering. Brady is from Willows, California, raised on rice and cattle!

“Water resources for agriculture production has always interested me. I am excited to further my learning and apply my skills within GCID. Water infrastructure design, innovation, and management is an area I’m very interested in.”

GCID is excited to have him join the team this summer!

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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