Hopkinton Dam
Dam in Merrimack County, New Hampshire · Contoocook River · forms Hopkinton Lake
Height
71 ft
22 m (NID height)
Length
790 ft
241 m
Completed
1962
Hopkinton Lake today
382.29 ft
7 days ▼ 0.04 ft
Normal storage
700 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 3:00 PM EDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Recreation
- Dam type
- Rockfill
- Structural height
- 71 ft
- Owner
- USACE - New England District (Federal)
- Maximum storage
- 128,000 acre-ft
- Surface area
- 220 acres
- Hydraulic height
- 64 ft
- Drainage area
- 382 sq mi
- Spillway
- Uncontrolled, 300 ft wide
- Army Corps district
- New England District
- Also known as
- Hopkinton Lake
- NID ID
- NH00004
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID NH00004 at nid.sec.usace.army.mil. Project website.
Other dams at Hopkinton Lake
- Hopkinton Dam - Dike H-2
- Hopkinton Dam - Dike H-3
- Hopkinton