Press Release - Hood Pd Dam/Derry Rail Trail Extension

The New Hampshire Department of Environmental Services (NHDES) has recently changed the hazard classification of the Hood Pond Dam which is owned by the Town of Derry. NHDES had requested updated hydraulic calculations to determine whether the dam meets a higher level standard to pass 2.5 times the flow of a 100 year storm. Based on the preliminary calculations submitted to NHDES, the dam does not meet this standard and the Town of Derry will be required to modify the elevation of the existing earthen dam along the western side of Hood Pond. The Town would like to reassure the public that the dam is structurally sound and it has ample capacity for a 100 year storm, a requirement under the former hazard classification.