Six Rivers Regional Trail System
Client—City of Castle Rock, Washington
The Six Rivers Regional Trail System (SRRTS) is the result of a county-wide effort to plan, develop, and maintain a 41-mile recreational trail system. The effort is being led by Pathways 2020, a non-profit organization focused on improving quality of life and health in Cowlitz County.
Alternatives Analysis: Gibbs & Olson prepared an Alternatives Analysis and a Comprehensive Cost Evaluation. The analysis outlines a plan to develop and maintain a 41‑mile multi‑use, non‑motorized recreational trail system. When fully constructed, the trail will span the full length of Cowlitz County from north to south, generally following the Interstate 5 (I-5) corridor. The Cost Evaluation included planning level opinions of costs for use in obtaining funding and constructing future project segments.
Phase 1: Gibbs & Olson provided design and construction phase services for the Phase 1 improvements on SR 411 in Castle Rock. Upgrades included narrowing travel and center turn lanes over the I‑5 overpass, widening shoulders to improve pedestrian and bicyclist safety, adding lane markings to delineate shoulders, and reconfiguring crosswalks at the I‑5 southbound on‑ and off‑ramps.
Phase 2: Gibbs & Olson is currently designing improvements along Huntington Avenue, which include providing pedestrian pathway lighting, an asphalt pathway extension, and installing a pedestrian crossing.
