Collier Canyon-S Flynn-Livermore Valley

Saturday, April 4, 2015

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This ride heads east from Danville for a quiet back country loop up Collier Canyon into Livermore. Continue along Patterson Pass Rd for the climb up S Flynn to Carroll Rd. Return west on Altamont Pass Rd and roll through the gentle hills along Livermore Valley back to Osage Station Park.

Exit the park, turn right on Paraiso Dr and meander through the residential neighborhood to Greenbrook Dr.

Turn right and head east through the residential neighborhoods out along Sycamore Valley Rd and Camino Tassajara. The flat miles goes pass the golden hills of Sycamore Valley Open Space and the displays of trees, plants and flowers at the Tassajara Nursery.

Camino Tassajara continues out of Danville and heads south towards the country with wide open pastoral ranch lands and rolling hills through the unincorporated town of Tassajara.

The turn on Highland Rd travels east on gentle rolling terrain through “horse country” with boarding ranches and training facilities. The beautiful hills are dotted with grazing cattle and scattered barns.

The climb up Collier Canyon Rd is 0.6 mile with an average grade of 4.8%; you’re near the top when you see the old water tower and windmill.

Collier Canyon Rd continues on flat-rolling terrain for the next 4.8 scenic country miles to the south end at Portola Ave; the road crosses into Alameda County towards Livermore Valley with minimal to no traffic.

The expansive ranch lands are populated with a few working cattle ranches and a large horse boarding facility.

Old weathered wooden barns are commonplace along this lovely stretch of road.

Head east on Portola Ave into Livermore; the road crosses over I-580 and continues along the residential neighborhoods out to First St & N Mines Rd.

Continue east on Patterson Pass Rd; the road exits the neighborhoods out to the flat Industrial Park area of Livermore to Greenville Rd.

Patterson Pass Rd continues out through the flat valley for the next 1.2 miles to S Flynn Rd.

Turn left onto S Flynn Rd for the stair-step ascent towards the windmill farms. The first section climbs up through a scattering of ranches for 1.3 miles with an average grade of 4.4%.

You’re at the first high point when you reach the hill top ranch.

Turn around and admire the valley views!

S Flynn Rd levels out for a short segment around the upper valley before kicking up to the next climb.

The road tilts up for 0.9 mile with gradient ranges of 6-9%. The last pitch up to the summit has steep grades of 11-13%!

S Flynn rounds the bend with views of the windmill up ahead.

On the forced left turn, the road name changes to N Flynn Rd as it winds down around the hills to Carroll Rd.

Carroll Rd takes you across I-580 for a fast descent onto Altamont Pass Rd.

The left turn on Altamont Pass drops down along the railroad grade paralleling I-580 to Northfront Rd into Livermore.

Turn right on N Vasco Rd and make your way out of the city through a series of turns on Dalton and Ames to Raymond Rd.

The run along Dagnino and May School Rd has fantastic views of the mountain ranges and the surrounding valley ranches.

Enjoy the magnificent expansive Livermore Valley grasslands and pastoral fields!

Head NW through the quiet back roads on N Livermore Ave to Manning Rd. Take in the splendid country landscape of weathered barns and open fields.

Manning Rd rolls through the idyllic country valley ranches and beautiful open grasslands to Carneal Rd.

Carneal Rd cuts across the valley to Highland Rd.

Continue west on Highland Rd; return through the country ranches and equine facilities back to Camino Tassajara.

Reverse your way on Camino Tassajara to Sycamore Valley Rd and take Brookside Dr back to Osage Station Park.

This is a beautiful ride from the suburbs out to the quiet country back roads around Livermore. You’ll definitely enjoy the remote scenic climb up S Flynn to N Flynn-the valley views are amazing!

Garmin Stats
53.37 Miles with 2254′ of elevation gain
Max elevation: 1289′
Max grade: 13%
Terrain: Flat-rolling with a couple of low climbs

Weather: Sunshine & blue skies. Temps ranged from the low 50’s to the mid 70’s with breezy NW > SW winds.

View the interactive RGPS route map & profile

Collier Cyn S Flynn

Follow this route for today’s ride:

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