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New Hampshire Department of Environmental Services

Lamprey River

A water management plan designed to maintain the river’s protected instream flows is in place for the Lamprey River. The water management plan was developed as the second part of the Instream Flow Protection Program’s work to conduct a study to determine stream flow requirements for each Designated River and then to develop and employ management plans to maintain them.

The study process and the water management plan were developed as a project consisting of 12 tasks. The protected instream flow study was completed in tasks 1 through 7 resulting in a final report containing the final recommendations for protected instream flows. Upon completion of the study, the NHDES commissioner approved the protected instream flows described in the report with the Commissioner’s Declaration of the Establishment of Protected Instream Flows for the Lamprey Designated River.

The water management plan was developed with water users and dam owners and other interest groups. Under tasks 8 through 12, management needs to support stream flows that were calculated and management alternatives evaluated and selected. Management actions include water use management and conservation plans for affected water users, and dam management operations by affected dam owners. Management actions are taken after stream flows fall under defined thresholds for extended durations of time. The water management plan documents each water user or dam owners’ management actions.

NHDES has developed an assessment tool to determine when management actions should be applied. The assessment tool (Current Lamprey Instream Flow Conditions, linked below) tracks the daily stream flows and describes conditions with respect to the protected instream flow criteria.

Water Management Plan - Lamprey Water Management Plan established August 30, 2013

Real Time Data

Management Actions (Historical Management Action Notifications)

Protected Instream Flow Study - Lamprey Protected Flows Established August 30, 2013

Lamprey References

Map of the Lamprey River



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NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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