Project Overview

River Habitat Restoration Area

Site Overview

Envirocon completed a habitat restoration project located in a delta of islands where a river flows into a lake. The islands that make up the delta are a major flyway for multiple species of migratory waterfowl. In recent years, the delta has experienced extensive wind and wave erosion. The goal of the project was to rebuild portions of the islands to provide habitat and armor for protection from additional loss of acreage.

Project Highlights

  • Constructed 11 bendway weirs using 64,000 tons of imported 18- and 24-inch rock for erosion protection of river banks
  • Installed a 175-foot long modular bridge using a modular barge for the center pier, allowing the bridge elevation to fluctuate with the water flow for access to the islands
  • Constructed peninsulas with 80,000 cubic yards of gravel material
  • Used Durabase Mat System to safely support loaded haul trucks on soft sediment material
  • Restored impacted areas with native seed mix and planted 51,000 willow trees

Value Delivered

Envirocon worked closely with the client to proactively modify the design in the field, and develop alternate approaches to manage design issues and changing conditions. For both the north and south peninsula fills, Envirocon recommended using a more competent import material along the perimeter then was specified. This softer material was less expensive, easier to obtain, and provided better drainage to support vegetative growth. We finished the project on schedule with zero recordable incidents.