Spearfish Valley Ranch
Spearfish Valley Ranch is an earth dam located in Lawrence County, South Dakota, built in 1968. It carries a Low hazard potential classification.
About Spearfish Valley Ranch
The primary purpose of Spearfish Valley Ranch is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Melvin Delzer (private). It impounds the Tr-redwater near Belle Fourche.
The dam stands 32 feet tall and stretches 660 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 136 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1968, the structure is well into its service life at over 50 years old.
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. The most recent inspection on record was 07/18/1986. That was over 39 years ago.
At 32 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | South Dakota |
| County | Lawrence |
| Nearest City | Belle Fourche |
| River/Stream | Tr-redwater |
| Coordinates | 44.57179, -103.86709 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 660 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 136 acre-ft |
| Max Storage | 136 acre-ft |
| Normal Storage | 98 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 520 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | MELVIN DELZER |
| Owner Type | Private |
| Hazard Classification | Low |
| Last Inspection | 07/18/1986 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD01014 |
| Federal ID | SD01014 |
| More Info | State Dam Safety Program |