Highway 99 Revamp

Evening commuters make their way through the intersection of Highways 99 and 20 Thursday, October 31, 2013 in Yuba City.

The Yuba City City Council authorized the next phase in a $100 million-plus interchange project.

The goal is to replace the intersection at highways 99 and 20 with an interchange, according to a City Council staff report.

The council directed staff to sign the project study report. The next step in the process would be a $5.5 million project approval and environmental document. There are no funds programmed at this time from the local, state or federal level to continue to the next phase, according to the staff report. City staff recommends continued dialogue with the California Department of Transportation and the Sacramento Area Council of Governments to identify funding opportunities in the future. 

In a 2016 transportation workshop, the City Council expressed a desire to expedite the consideration of the interchange and began communications with Caltrans, according to the staff report. Caltrans told the city it would need to pay for the preparation of a project study report.

After two drafts of the proposal since August 2016, the document was completed in February this year. The city paid Caltrans $292,00 to prepare the project study report. It evaluates four interchange configuration alternatives: 

nSingle quadrant with slip on-ramp – Traffic movement on Highway 20 (under the structure) would be controlled by two intersections. The right-of-way would include partial or full acquisition of 32 parcels. The estimated cost of this alternative is $100 million.

• Single point – Traffic movement on Highway 20 (under the structure) would be controlled by a single intersection. Right-of-way would include full or partial acquisition of 36 parcels. The estimated cost of this alternative is $126 million.

• Single quadrant – Traffic movement on Highway 20 (under the structure) would be controlled by two intersections, and right-of-way would include full or partial acquisition of 36 parcels. The estimated cost of this alternative is $123 million.

• Single point with lowering of SR 20  – This alternative would lower Highway 20 by 12 feet to reduce the overall height of the interchange structure. Traffic movement on Highway 20 (under the structure) would be controlled by a single intersection and right-of-way would include the full or partial acquisition of 42 parcels. The estimated cost of this alternative is $131 million.

The basic concept for all four alternatives, according to the staff report, includes:

• Shifting the Highway 99 alignment to the west;

• Providing a grade separation with Highway 99 crossing over Highway 20;

• Access to Highway 99 from Woodward Street, East Onstott Frontage Road, and West Onstott Frontage Road would be terminated;

• Kelton Way would be extended to connect to East Onstott Frontage Road;

• A frontage road would be constructed to connect West Onstott Frontage Road with Woodward Street;

• Driveway access along Highway 20 from Civic Center Boulevard to Stabler Lane will be maintained on both the north and south sides;

• Assumes the city will acquire the Union Pacific Railroad right-of-way to connect West Onstott Frontage Road to Civic Center Boulevard. The connection is not part of the project;

• Design constraints include weaving distance, merging tapers for Highway 20 and possibly the ramps for southbound Highway 99, and shoulders on Highway 20. 

The staff report states the estimated total cost for the project ranges from $106 million to $136 million, though it also indicates Caltrans’ transportation corridor concept report does not provide an estimated cost for the interchange. The right-of-way acquisition is estimated to occur between 2021-2036, costing about $31 million. Caltrans has not identified a timeline for construction.

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