Sitla - Sienna Hills is an earth dam located in Washington County, Utah. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 330 ft long, taller than 55% of U.S. dams with a recorded height. 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 Sitla - Sienna Hills
The primary purpose of Sitla - Sienna Hills 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 Sitla (private). It impounds the Grapevine Crossing Wash.
The dam stands 26 feet tall and stretches 330 feet across, and has a storage capacity of 15 acre-feet.
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.
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Location
| State | Utah |
| County | Washington |
| River/Stream | Grapevine Crossing Wash |
| Coordinates | 37.14372, -113.48315 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Length | 330 ft |
Storage & Hydraulics
| NID Storage | 15 acre-ft |
| Normal Storage | 15 acre-ft |
| Max Discharge | 847 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Sitla |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | UT53875 |
| Federal ID | UT53875 |
| More Info | State Dam Safety Program |