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Ice Jam in Plymouth, NH


Ice jam in Plymouth, NH - meeting

HOLDERNESS, N.H. — Officials say an ice jam caused a river to flood near a New Hampshire college and submerged dozens of vehicles in several feet of water. Students at Plymouth State University tell WMUR-TV they were informed on Sunday morning that they had to move their cars from the parking lot behind an ice rink in Holderness. An ice jam on the Pemigewasset River left about 50 cars submerged in water up to their windows. A towing company removed some of the cars on Sunday morning, but had to leave due to the flooding. Some students were evacuated from their apartments. Officials say the ice jam was about 4 miles long. Temperatures dropped on Sunday night, turning the water in the parking lot into ice.

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USGS UAS Rapid Response, February 27-28, 2017

Ice jam in Plymouth, NH - meeting

An aerial data collection was requested by the USGS State Liaison (Lin Neifert) and the New Hampshire Department of Environmental Services in response to an ice dam (jam) occurring in and near the towns of Plymouth and Holderness, NH with resulting flooding before and after the release of the ice dam. The USGS contacted a UAS operator (Media Wing LLC (Airshark)) located in Montpelier, VT to collect low altitude, high-resolution imagery over a 4-mile stretch of the Pemigewasset River. The commercial operator was tasked by the USGS National UAS Project Office in Denver, CO through an end-product contract and was able to begin acquiring data within 3-4 hours.

The commercial operator delivered the collected data, as well as a mosaicked image of the area, to the USGS State Liaison by late afternoon the same day the data was collected, see below. The USGS sent data via ftp to the Denver Office to process and also delivered the data to the New Hampshire State Department of Environmental Conservation and the Cold Regions Research and Engineering Laboratory (CRREL) for briefings to the Governor, first responders and news outlets.
Ice jam in Plymouth, NH - meeting
Ice jam in Plymouth, NH - meeting

Plymouth Ice Jam Imagery from NH GRANIT

Aerial imagery of the Plymouth ice jam, collected on February 27, 2017 via UAV, is now available.

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Page Last Modified: Monday, 27-Mar-2017 12:40:22 EDT