Hoague - Sprague
Hoague - Sprague is a timber crib dam located in Merrimack County, New Hampshire, built in 1906. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Hoague - Sprague
The primary purpose of Hoague - Sprague is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by West Hopkinton Hydro, Llc (private). It impounds the Contoocook River near Hopkinton.
The dam stands 14 feet tall and stretches 350 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 26 acre-feet, and collects water from a drainage area of 427 square miles. Completed in 1906, the structure is over a century 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. 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 06/19/2024.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | Hopkinton |
| River/Stream | Contoocook River |
| Coordinates | 43.19000, -71.74840 |
Physical Characteristics
| Dam Type | Timber Crib |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 350 ft |
| Year Completed | 1906 (120 years old) |
Storage & Hydraulics
| NID Storage | 26 acre-ft |
| Max Storage | 26 acre-ft |
| Normal Storage | 26 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 427 sq mi |
| Max Discharge | 19,562 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | West Hopkinton Hydro, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/19/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00070 |
| Federal ID | NH00070 |
| More Info | State Dam Safety Program |