Blanding City No. 4
Blanding City No. 4 is an earth dam located in San Juan County, Utah, built in 1965. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Blanding City No. 4
The primary purpose of Blanding City No. 4 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Blanding City (local government). It impounds the Westwater Creek near None-drains To Cotto.
The dam stands 100 feet tall and stretches 2,057 feet across, and has a maximum storage capacity of 2,779 acre-feet. Completed in 1965, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 09/27/2023.
At 100 feet, this dam is taller than 98% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Utah dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Utah |
| County | San Juan |
| Nearest City | None-drains To Cotto |
| River/Stream | Westwater Creek |
| Coordinates | 37.66518, -109.49734 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 100 ft |
| Dam Length | 2,057 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 2,779 acre-ft |
| Max Storage | 2,779 acre-ft |
| Normal Storage | 2,442 acre-ft |
| Max Discharge | 85 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | BLANDING CITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/27/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00043 |
| Federal ID | UT00043 |
| More Info | State Dam Safety Program |