Tuacahn Wash Upper Detention Basin is an earth dam located in Washington County, Utah, built in 2013. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 460 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Tuacahn Wash Upper Detention Basin
The primary purpose of Tuacahn Wash Upper Detention Basin is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Ivins City (private).
The dam stands 20 feet tall and stretches 460 feet across, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2013, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/27/2022.
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Location
| State | Utah |
| County | Washington |
| Nearest City | Ivins |
| Coordinates | 37.18830, -113.65543 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Length | 460 ft |
| Year Completed | 2013 (13 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 25 acre-ft |
| Drainage Area | 2 sq mi |
| Max Discharge | 433 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Ivins City |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/27/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT53538 |
| Federal ID | UT53538 |
| More Info | State Dam Safety Program |