Rattlesnake Ranch No.2 (lower) is an earth dam located in San Juan County, Utah, built in 1972. It carries a Significant hazard potential classification.
Dam profile
NID height · 43 ft43 ft tall and 780 ft long, taller than 89% 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 Rattlesnake Ranch No.2 (lower)
The primary purpose of Rattlesnake Ranch No.2 (lower) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Jim Blankenagel (private). It impounds the Coyote Wash near Moab.
The dam stands 43 feet tall and stretches 780 feet across, has a maximum storage capacity of 420 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1972, the structure is well into its service life at over 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/16/2022.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Utah |
| County | San Juan |
| Nearest City | Moab |
| River/Stream | Coyote Wash |
| Coordinates | 38.29018, -109.30567 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Length | 780 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 420 acre-ft |
| Max Storage | 420 acre-ft |
| Normal Storage | 377 acre-ft |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Jim Blankenagel |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/16/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00253 |
| Federal ID | UT00253 |
| More Info | State Dam Safety Program |