Spackman Brothers Dam is an earth dam located in Cache County, Utah, built in 1982. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 1,651 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 Spackman Brothers Dam
The primary purpose of Spackman Brothers Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Spackman Brothers (private). It impounds the Cub River - Offstream near Amalga.
The dam stands 11 feet tall and stretches 1,651 feet across, has a storage capacity of 430 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1982, the structure is 44 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. The most recent inspection on record was 05/18/2022.
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Location
| State | Utah |
| County | Cache |
| Nearest City | Amalga |
| River/Stream | Cub River - Offstream |
| Coordinates | 41.91775, -111.86307 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 1,651 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 430 acre-ft |
| Normal Storage | 430 acre-ft |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Spackman Brothers |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/18/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | UT00547 |
| Federal ID | UT00547 |
| More Info | State Dam Safety Program |