Hopkinton Dam Quick Facts
Hopkinton Dam Map
Hopkinton Dam Information
Hopkinton Dam is a rockfill earth dam located in West Hopkinton, Merrimack, New Hampshire.
The dam, which is on the Contoocook River, was primarily built for Flood Risk Reduction purposes, but also serves for Recreation benefits.
The dam was designed by CENAE and commissioned in 1962 and is currently owned by USACE – New England District.
Hopkinton Dam Structure
The Hopkinton Dam is approximately 790 feet (241 m) long, 71 feet (22 m) high and has a structural volume of 1,919,000 cubic yards (1,467,181 cubic metres).
Hopkinton Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 700 acre-ft (863 Ml) and maximum capacity of 128,000 acre-ft (157,885 Ml).
The surface area of the reservoir is 220 acres (89 ha) and the total catchment area is 382 square miles (989 square kilometres).
Hopkinton Dam Spillway
The dam has a 300 feet (91 m) wide uncontrolled spillway with a maximum discharge capacity of 59700 cubic feet per second (1691 cubic metres per second).
Hopkinton Dam Compared to Five Famous American Dams
Hopkinton Dam Weather
Current Conditions at Hopkinton Dam
| Parameter | Value |
|---|---|
| Current Time | 20:25 |
| Sunrise | 07:12 |
| Sunset | 16:44 |
| Temperature (°F) | 8 |
| Feels Like (°F) | -1 |
| Cloud Coverage (%) | 55 |
| Pressure (inHg) | 1032 |
| Humidity (%) | 57 |
| Wind Speed (mph) | 5 |
| Rain (mm) | 0 |
7-Day Forecast for Hopkinton Dam
| Day | Min Temp (°F) | Max Temp (°F) | Feels Like (°F) | Pressure (inHg) | Humidity (%) | Wind Speed (mph) | Wind Gust (mph) | Wind Dir | Precip Prob (%) | Precip Volume (mm) | Weather |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Today | 6 | 16 | 3 | 1032 | 44 | 11 | 24 | W | 0 | - |  |
| Wed | 2 | 18 | 10 | 1031 | 43 | 7 | 9 | WNW | 0 | - | |
| Thu | 10 | 27 | 12 | 1025 | 48 | 12 | 21 | SSW | 0 | - |  |
| Fri | 12 | 28 | 17 | 1019 | 56 | 12 | 23 | WNW | 0 | - | |
| Sat | 8 | 27 | 15 | 1027 | 53 | 8 | 26 | WSW | 0 | - | |
| Sun | 23 | 34 | 22 | 1020 | 63 | 14 | 38 | W | 0 | - | |
| Mon | 25 | 38 | 25 | 1011 | 73 | 12 | 32 | W | 31 | - |  |
| Tue | 5 | 33 | 22 | 999 | 66 | 16 | 39 | W | 100 | - | |
Hopkinton Dam Frequently Asked Questions
Hopkinton Dam is in New Hampshire.
Hopkinton Dam is in Merrimack County.
Hopkinton Dam is 71 feet high.
Hopkinton Dam is 790 feet long.
More Dams in Merrimack County:
Blackwater DamEastman Falls Dam
Franklin Falls Dam
Garvins Falls Dam
Hopkinton Dam
Pleasant Lake Dam
Turkey Pond Dam
More Dams in New Hampshire:
Arlington Mill Res Evergreen DikeArlington Mills Res West Dike
Arlington Mills Res Wheeler Dam
Ayers Island Dam
Bellows Falls Dam
Big Dan Hole Pond Dam
Blackwater Dam
Bow Lake Dam
Comerford Dam
Conway Lake Dam
Crescent Lake Dam
Eastman Falls Dam
Eastman Lake Dam
Edward MacDowell Dam
Errol Dam
Everett Dam
First Conn Lake South Bay Dike
First Connecticut Lake Dam
Franklin Falls Dam
Garvins Falls Dam
Goose Pond Dam
Grafton Pond Dam
Great East Lake Dam
Hopkinton Dam
Jackman Reservoir Dam
Lake Kanasatka Dam
Lake Waukewan Dam
Lakeport Dam
Lochmere Dam
Mascoma Lake Dam
Massabesic Lake Dam
Merrymeeting Lake Dam
Milton Three Ponds Dam
Moore Dam
Murphy Dam
Newfound Lake Dam
Nubanusit Lake Dam
Ossipee Lake Dam Berry Bay
Ossipee Lake Dam Headworks Dam
Otter Brook Dam
Pawtuckaway Lake /Drowns Dam
Pawtuckaway Lake Dollof Dam
Pawtuckaway Lake/Gove Dike
Pleasant Lake Dam
Powder Mill Dam
Rust Pond Dam
Second Connecticut Lake Dam
Silver Lake Dam
Spofford Lake Dam
Squam Lake Dam
Condition Assessment Classification
Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor
A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner’s property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Source: National Inventory of Dams