Mill Hollow
Mill Hollow is an earth dam located in Wasatch County, Utah, built in 1962. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Mill Hollow
The primary purpose of Mill Hollow is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Division Of Wildlife Resources (state). It impounds the Mill Hollow near Woodland.
The dam stands 52 feet tall and stretches 225 feet across, has a maximum storage capacity of 440 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1962, 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 08/30/2023.
At 52 feet, this dam is taller than 93% of dams nationwide.
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 | Wasatch |
| Nearest City | Woodland |
| River/Stream | Mill Hollow |
| Coordinates | 40.49334, -111.10371 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 52 ft |
| Dam Length | 225 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 440 acre-ft |
| Max Storage | 440 acre-ft |
| Normal Storage | 328 acre-ft |
| Drainage Area | 2 sq mi |
| Max Discharge | 49 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | DIVISION OF WILDLIFE RESOURCES |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/30/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | UT00207 |
| Federal ID | UT00207 |
| More Info | State Dam Safety Program |