Cap Rock #4 is an earth dam located in Custer County, Montana, built in 1954. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 175 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 Cap Rock #4
The primary purpose of Cap Rock #4 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Cap Rock Ranch Inc (private). It impounds the Harris Creek near Terry.
The dam stands 17 feet tall and stretches 175 feet across, and has a maximum storage capacity of 125 acre-feet. Completed in 1954, 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.
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Location
| State | Montana |
| County | Custer |
| Nearest City | Terry |
| River/Stream | Harris Creek |
| Coordinates | 46.70880, -105.77630 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 175 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Normal Storage | 56 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Cap Rock Ranch Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01799 |
| Federal ID | MT01799 |
| More Info | State Dam Safety Program |