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Caltrans > District 4 > Highway 101 Widening in Santa Rosa > Construction
 Highway 101 Widening Brochure
The California Department of Transportation (Caltrans) has begun a major construction project to widen US 101 from four to six lanes between Route 12 and Steele Lane in Santa Rosa. The new lanes will be northbound and southbound carpool lanes, which will add capacity and encourage ridesharing in this congested corridor. The project construction will consist of 3 stages during a 2 ½ year period.
Construction Stage Maps: 
Stage 1 Construction:
Stage 2 Construction
- Stage 2, Phase 1: 4th Street Closed (Pending)
- Stage 2, Phase 2: No full closures (Pending)
Stage 2 Construction
- Stage 3, Phase 1: SB Downtown On-ramp closed (Pending)
- Stage 3, Phase 2: No full closures (Pending)
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