Boulder County
60 Colorado mutual ditch and reservoir companies have DWR-verified water structures in Boulder County, the oldest decreed right dating to 1859; 16 are DARCA members. 91 companies list a registered address in a city located in — or partly in — Boulder County.
| Company | Standing | Verified structures | Relationship |
|---|---|---|---|
| Agitator Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Anderson Ditch Company | In good standing | 2 WDIDs | Operates structures in Boulder County |
| Andrews-Farwell Ditch and Reservoir Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Base Line Land And Reservoir Company | In good standing | — | Registered in Lafayette |
| Beckwith Ditch And Reservoir Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Bonus Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Boulder & Left Hand Irrigation Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Boulder and Larimer County Irrigating and Manufact | In good standing | 1 WDID | Operates structures in Boulder County |
| Boulder And Left Hand Irrigation Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Boulder And Weld County Ditch Company | In good standing | 3 WDIDs | Operates structures in Boulder and Weld counties Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Boulder And White Rock Ditch And Reservoir Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Brennan Box Lateral Company | In good standing | — | Registered in Lafayette |
| Bunyan Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Butte Irrigating And Milling Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Clover Basin Irrigation Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Culver Irrigation Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Dave Miller Mutual Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Lyons |
| Davidson Ditch & Reservoir Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Davidson Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Davidson High Line Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Denio & Taylor Mill Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Desert Reservoir Company | In good standing | — | Registered in Boulder |
| Dry Creek No. 2. Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| Dry Creek-Davidson Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| East Boulder Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County |
| Eisele Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Enterprise Ditch Company | Delinquent | 1 WDID | Operates structures in Boulder County |
| Erie Coal Creek Ditch & Reservoir Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Farmer's Ditch Company | In good standing | 3 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Farmers Reservoir And Irrigation Company | In good standing | 6 WDIDs | Operates structures in Adams, Weld, Jefferson and Boulder counties |
| Godding Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Goodhue Ditch & Reservoir Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Louisville |
| Green Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Haldi Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| Highland Ditch Company | In good standing | 2 WDIDs | Operates structures in Boulder County |
| Highland Lake Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Hillside Estates Irrigation Co. LLC | In good standing | — | Registered in Niwot |
| Holland Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Howard Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| Howard Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Independent Reservoir Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Ish Reservoir Company | In good standing | 1 WDID | Operates structures in Boulder County |
| Island Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County |
| James Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| James Ditch Minority Shareholders Association, LLC | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Jones And Donnelly Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Last Chance Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Left Hand Ditch Company | In good standing | 23 WDIDs | Operates structures in Boulder County Registered in Boulder |
| Leggett Ditch And Reservoir Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Leyner-Cottonwood Consolidated Ditch Co. | In good standing | 1 WDID | Operates structures in Boulder County Registered in Erie (Erie spans Weld & Boulder counties) |
| Longmont Supply Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County |
| Lower Oligarchy Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Lyons Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Lyons |
| Marshallville Ditch Co. | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| Matthews Farms Estates Irrigation Water Company, LLC | Delinquent | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| McGinn Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| McKay Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Meadow Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Lyons |
| Mountain View Estates Irrigation Association | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| New Coal Ridge Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| New Consolidated Lower Boulder Reservoir And Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| New Hinman Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| New Table Mountain Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Niwot Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| No. 3 Outlet Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| North Boulder Farmers Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| North Tollgate Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Oligarchy Extension Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Oligarchy Irrigation Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Original Cottonwood Ditch Company | In good standing | — | Registered in Boulder |
| Osborn Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Palmerton Consolidated Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Peck Ditch Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Pella Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Pennock Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Pleasant Valley Reservoir Fish And Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Plumb And Dailey Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Reed Lateral Ditch And Pipe Line Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Rough And Ready Irrigating Ditch Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Runyan Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Rural Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Sanborn Reservoir and Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Silver Lake Ditch And Reservoir Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| Smith And Emmons Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Snowy Range Reservoir Company | In good standing | — | Registered in Boulder |
| South Boulder And Bear Creek Ditch Company | In good standing | — | Registered in Lafayette |
| South Boulder And Coal Creek 1st Extension Ditch Company | In good standing | — | Registered in Louisville |
| South Boulder And Coal Creek Irrigating Ditch Comp | In good standing | — | Registered in Louisville |
| South Boulder Canon Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| South Flat Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| South Ledge Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| South Tollgate Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| St. Vrain Reservoir And Fish Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Star Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Supply Irrigating Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Supply Lateral Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Swede Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Terry Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| The Boulder and White Rock Lateral and Siphon Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| The Githens Lateral Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Boulder |
| The Mc Kay Lateral Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Upper Baldwin Ditch Company | In good standing | 2 WDIDs | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| W. R. Blower Mutual Ditch Company, Inc. | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Wellman Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Westview Estates Irrigation and Water Users Association | In good standing | — | Registered in Erie (Erie spans Weld & Boulder counties) |
| Williamson Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Wiswall Ditch Company | "Exists" (as recorded by the Secretary of State) | 1 WDID | Operates structures in Boulder County |
| Yellowstone Lateral Ditch Company | In good standing | — | Registered in Longmont (Longmont spans Boulder & Weld counties) |
| Zweck And Turner Ditch Company | In good standing | 1 WDID | Operates structures in Boulder County Registered in Longmont (Longmont spans Boulder & Weld counties) |
Scroll the table sideways to see every column.
Standing is from the Colorado Secretary of State as of August 3, 2026: In good standing and “Exists” are both current statuses; Delinquent most commonly follows a missed Periodic Report (other causes exist — see the delinquency guide), usually fixable in one sitting; — means the company has no row in the current Secretary of State pull. Full explanation: what this check tells you.