Zezas Irrigation
Zezas Irrigation is an earth dam located in Johnson County, Wyoming, built in 1973. It carries a Low hazard potential classification and has a poor condition assessment.
About Zezas Irrigation
The primary purpose of Zezas Irrigation is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John Zezas & Sons Ranch Inc. (private). It impounds the Colorado Flats Draw near Arvada.
The dam stands 43 feet tall and stretches 1,120 feet across, creates a reservoir covering 56 acres, and has a maximum storage capacity of 965 acre-feet. Completed in 1973, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/03/2024.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Colorado Flats Draw |
| Coordinates | 44.08194, -106.58000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 39 ft |
| Dam Length | 1,120 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 965 acre-ft |
| Max Storage | 965 acre-ft |
| Normal Storage | 665 acre-ft |
| Surface Area | 56 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOHN ZEZAS & SONS RANCH INC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/03/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01038 |
| Federal ID | WY01038 |
| More Info | State Dam Safety Program |