Blackwater Dam - Dodge Estate Dike, also known as the Dry Reservoir, is a federal structure located in Webster, New Hampshire along the Blackwater River.
Wind
Humidity
Completed in 1941, this gravity dam stands at 18 feet high and spans 400 feet in length, with a dam volume of 299,000 cubic feet. With a primary purpose of flood risk reduction, the dam has a maximum storage capacity of 93,400 acre-feet and can discharge up to 42,800 cubic feet of water per second through an uncontrolled spillway.
Managed by the US Army Corps of Engineers, the dam poses a high hazard potential and undergoes inspections every 5 years. While the condition assessment is not available, emergency preparedness measures are in place, including an Emergency Action Plan (EAP) and regular risk management activities. The USACE works to mitigate flood risks associated with the dam by monitoring its health, prioritizing risk-reducing activities, and collaborating with local emergency managers to raise awareness and develop emergency response plans.
Despite their efforts, dams like Blackwater Dam are not immune to the impacts of severe weather events or flooding. The USACE's goal is to address all types of flood risks by managing water levels, releasing water as needed, and ensuring the structural integrity of the dam. As they continue to monitor and maintain the dam, additional information specific to Blackwater Dam's risk management strategies will be provided in the future.
Year Completed |
1941 |
Dam Length |
400 |
Dam Height |
18 |
River Or Stream |
BLACKWATER RIVER |
Primary Dam Type |
Gravity |
Surface Area |
1 |
Hydraulic Height |
13 |
Drainage Area |
128 |
Nid Storage |
93400 |
Structural Height |
18 |
Hazard Potential |
High |
Nid Height |
18 |