Holloway Lake is a concrete dam located in Ravalli County, Montana, built in 1900. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 63 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Holloway Lake
The primary purpose of Holloway Lake is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Sweeney Cr Water Users (private). It impounds the North Fork Sweeney Creek near Florence on Bitterroot R.
The dam stands 20 feet tall and stretches 63 feet across, creates a reservoir covering 25 acres, has a storage capacity of 280 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1900, the structure is over a century 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 06/19/2003. That was over 23 years ago.
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Location
| State | Montana |
| County | Ravalli |
| Nearest City | Florence on Bitterroot R |
| River/Stream | North Fork Sweeney Creek |
| Coordinates | 46.63310, -114.26210 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 63 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 280 acre-ft |
| Normal Storage | 280 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Sweeney Cr Water Users |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/19/2003 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00841 |
| Federal ID | MT00841 |
| More Info | State Dam Safety Program |