Trail Alerts

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Friday, June 1, 2012

18-Day Road Closure: Crystal Springs Road between Polhemus and Skyline/Hwy 35

Crystal Springs Road between Polhemus and Skyline/Hwy 35, in unincorporated San Mateo County just south of the Town of Hillsborough, will be closed be for 18 consecutive days from Monday, June 11th to Friday, June 29th . The road closure is necessary to replace a regional water pipeline as part of the Crystal Springs Pipeline No. 2 project.  

The closure will be in effect for cars and other vehicles 24 hours a day, Monday through Sunday, from June 11 to June 29. Bicycles only will have through access on Sundays to Sawyer Camp Trail. The road will be closed for cyclists Monday to Saturday – including Saturdays June 16th and 23rd.

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During the closure, cars will be detoured onto Hwy 280. Bicycles will be detoured to Hillsborough city streets.  (Click on map below for larger view)

Bicycle Detour:
From Hwy 35:
·         Take Golf Course Road/Hayne under 280
·         Turn Right on Black Mountain
·         Continue on Black Mountain
·         Turn Right on Hayne Road
·         Turn Right on Ascot
·         Turn Right on Brentwood
·         Turn Right on El Cerrito

From Polhemus Road:
·         Take Crystal Springs Road (North)
·         Turn Left on El Cerrito Road
·         Turn Left on Brentwood
·         Turn Left on Hayne Road
·         Continue under I-280 to Skyline Blvd.

Motorist Detour:
From Hwy 35:
·         Use 280 South to Bunker Hill
·         Exit Bunker Hill, continue East to Polhemus Road
·         Turn left on Polhemus

From Polhemus Road:
·         Go South on Polhemus
·         Turn right (West) on Bunker Hill
·         Take 280 North to Hayne/Black Mountain Exit


  1. So is 35 between Bunker Hill and Crystal Springs Rd opening back up? Or do motorists have to access Sawyer Camp Trail via Hayne Rd?

  2. Motorists should access Sawyer Camp Trail from the Black Mountain Road Exit (or nearby Hayne Road).

    Hwy 35 between Bunker Hill and Crystal Springs Road will remain closed for a couple more years, until San Mateo County completes the new bridge. The original 1920's-era bridge in that location was seismically insufficient and was demolished early last year.

  3. Will Hwy 35 between Bunker Hill and Crystal Springs Road be opening soon?

  4. Now that our construction project is concluded on the dam, the San Mateo County Department of Public Works will be scheduling the repair work on Hightway 35, its reopening.