Case Study: Walloomsac Geomorphic Assessment

Walloomsac River Phase 2 Geomorphic Assessment and Channel Management Plan

Bennington County Conservation District (Bennington, VT)


Gomez and Sullivan conducted a Phase 2 geomorphic assessment of the Walloomsac River and the Roaring Branch in Bennington, VT in association with Parish Geomorphic, Ltd. The Roaring Branch is a steep, boulder-strewn channel originating from the southern Green Mountains and flowing along the face of a glacial delta. Previous flooding throughout the town has resulted in the implementation of significant flood protection measures along both the Walloomsac River and Roaring Branch. To address these conditions, Phase 2 fieldwork was conducted along 11.3 miles of river, involving collecting information about channel dimensions, shoreline and riparian conditions, floodplain encroachments and modifications, and bottom substrate. The data collected during this assessment allowed for an understanding of how historic and current land and channel management activities have affected the river’s geomorphic condition. The results of the geomorphic assessment were used to develop a channel management and river corridor protection plan for the river system. The plan included mitigation alternatives to reduce the risks associated with flooding and fluvial erosion hazards. To further understanding of this watershed, Gomez and Sullivan was subsequently contracted to conduct Phase 2 geomorphic assessments of City Stream (4 reaches) and Bolles Brook (2 reaches) upstream in Woodford, VT, which join to form the Roaring Branch.