Point of Rock is a dam located in Cassia County, Idaho, built in 2004. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 630 ft long, taller than 68% of U.S. dams with a recorded height. 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 Point of Rock
Point of Rock is a dam in Cassia, Idaho. The dam is private-owned. It impounds the Marsh Creek Snake River.
The dam stands 30 feet tall and stretches 630 feet across, creates a reservoir covering 42 acres, has a storage capacity of 358 acre-feet, and collects water from a drainage area of 87 square miles. Completed in 2004, the structure is relatively new.
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. 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 07/28/2017.
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Location
| State | Idaho |
| County | Cassia |
| River/Stream | Marsh Creek Snake River |
| Coordinates | 42.46290, -113.51730 |
Physical Characteristics
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 630 ft |
| Year Completed | 2004 (22 years old) |
Storage & Hydraulics
| NID Storage | 358 acre-ft |
| Normal Storage | 358 acre-ft |
| Surface Area | 42 acres |
| Drainage Area | 87 sq mi |
| Max Discharge | 495 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/28/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ID00505 |
| Federal ID | ID00505 |
| More Info | State Dam Safety Program |