River & Lake Restoration
  Ponca State Park | Blue River | Green River | Lake Stevens |
   Los Angeles River

Tetra Tech has been working closely with the Seattle District Corps of Engineers on several phases of the over $100 million Green River Restoration Program. Completed tasks have included:

• Green River Basin Restoration Feasibility Analysis and Congressional Authorization Document (2000
• Sweeny Creek Culvert Replacement, Design and Construction Assistance (For fish passage)
• Basin wide hydrologic, hydraulic, sediment and geomorphic characteristics report
• Bathymetric Survey, Howard Hansen Reservoir
• Water Quality and Sediment Management Plan for Howard Hansen Dam
• Design and Construction assistance for engineered log jams and gravel renourishment berms for Aquatic Habitat Restoration