DeHart Dam Improvements Project

Background:

CRW’s primary raw water supply is the DeHart Reservoir, impounded by DeHart Dam. The dam was constructed in the early 1940s with an emergency spillway to release flow in a controlled manner during wet weather events. PA DEP informed CRW that the spillway capacity is inadequate to safely handle the Probable Maximum Flood event. CRW performed an initial evaluation of spillway expansion alternatives along with a geotechnical assessment of the impoundment. PA DEP released updated Probable Maximum Precipitation values in late 2019. These values impacted the proposed modifications. CRW is working with a consulting engineer (AECOM) to design the necessary dam improvements.

Project Purpose:

Various improvements to meet current PA DEP Dam safety standards.

Project Summary:

Reshape the existing straight ogee spillway with an alternate design that can provide greater flow over the crest. Replace the upper portion of the spillway chute and walls and anchor the new spillway into competent bedrock. Improvements also include raising the embankment, collection, and monitoring of seepage, an increase of pool drawdown capacity, and replacement of the access bridge. The project will be partially funded from DeHart Conservation Easement proceeds but will require additional bond issue/financing.

Estimated Timeline

2021-2024

Design & Permitting

2024-2026

Construction