Livermore Valley: Carroll-N Flynn-Collier Canyon

Saturday, November 28, 2015

View the entire Google Web Album

This ride heads east from Danville into Livermore Valley for short loop through the Altamont wind farms from Carroll Rd and N Flynn Rd. Drop down into the open valley onto Patterson Pass Rd and return west on Portola Ave for the scenic run along Collier Canyon back to Highland Rd and Camino Tassajara.

Exit Diablo Vista onto Camino Tassajara; this road heads south out of town towards the back country with wide open pastoral ranch lands and rolling hills through the unincorporated town of Tassajara to Highland Rd.

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.

At the Y intersection, stay on Highland for the short climb up and over into the valley. The road drops down from the Contra Costa County line into Alameda County at Manning Rd.

The flat terrain on Manning and N Livermore leads out through the beautiful expansive Livermore Valley.

Meander around the flat valley floor on May School to Dagnino and Raymond Rd. The open valley landscape offers splendid views of the soft rolling hills and country ranches.

Cut through the residential neighborhood on Broadmoor and Scenic to Herman and Northfront Rd.

Continue east on Altamont Pass Rd past the popular Club Moto Motorcross tracks along I-580; the gentle terrain goes under the train trestle and follows the old RR tracks up to Carroll Rd.

The climb up Carroll Rd is 0.8 mile with an average grade of 8.8% and steep pitches of 10-12%! The road levels out as you near the I-580 overpass to N Flynn Rd.

N Flynn Rd winds up through the hills at the far east end of Livermore; it climbs up around the Altamont windmills with gradient ranges of 4-6% for 1.4 miles.

The road name changes to S Flynn Rd as it rounds the bend towards the summit.

The road drops down into Livermore Valley from the hilltop ranch onto Patterson Pass Rd. Patterson Pass Rd continues down across the valley into Livermore.

At Greenville Rd, Patterson Pass Rd continues west along the north side of Lawrence Livermore Nat’l Laboratory and Livermore’s Industrial Park area into the residential neighborhoods to N Mines Rd.

Continue west on First St to Portola Ave; the road rolls through the residential neighborhoods around north Livermore and crosses over I-580 to Las Positas College and the newer developments along the upper ridge.

Collier Canyon Rd continues on flat gentle rolling terrain for the next 5.5 scenic country miles to the north end at Highland Rd; the road crosses into Contra Costa County towards Sycamore Valley with minimal to no traffic. Collier Canyon Rd cuts through Livermore Valley from the south end at Portola Ave in Alameda County to the north end at Highland Rd in Contra Costa County.

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

At the intersection with Carneal Rd, Collier Canyon climbs gently for about a mile with grades of 2-4.5% up to the old water tower and windmill. The fast descent drops down to the junction with Highland Rd.

At Highland Rd, reverse your way back out to Camino Tassajara to the suburban neighborhoods around Diablo Vista.

This is a wonderful scenic ride through the quiet less-traveled country back roads around Livermore Valley. The flat-rolling terrain keeps the legs spinning during these cool autumn days.

Garmin Stats:
42 Miles with 1850′ of elevation gain
Max elevation: 1322′
Max grade: 11%
Terrain: Flat-rolling with a couple of steep climbs

Weather: Sunny and cool with clear blue skies. Temps ranged from the low 40’s to the low 50’s with brisk NE winds.

View the interactive RGPS route map & profile

Livermore Valley

Follow this route for today’s ride:


  1. Hello Nancy, I’m willing to bet this route is even prettier during full springtime. So many to look forward to. Were -3 degrees here…….. Brrrrrr !! Seeya, from Michael and Maydene


Leave a Comment

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s