DU First Run and 3.6 Mile Racers:
You will run approximately 100 yards, past the Guard booth, slight uphill for approximately 14 mile.
There you will make a sharp right turn onto the Old San Pablo Dam Road. This is a wide trail, the Old
San Pablo Dam Road that cars used to travel on from Orinda to El Sobrante in the early 1900s. The
run is a rolling course, meaning there is up and there is down hills. After approximately 1.4 miles you
will go by a restroom and hit pavement. Continue on to the turnaround (mile 2). There will be people
there with water, Electrolyte drink, and Gels. Come back the same way then to your left you will see
the boat launch parking lot. You will be directed to a steep downhill to the transition area. For the
Short Course run it will be 2.000 Miles running the same route, but turn around at the Aid Station.
Bike Portion Duathletes 22 Miles and 40 Miles:
Grab your Bike Helmet and run to the transition line. Mount your bike with helmet on and get ready
for a scenic but tough ride. We have the entire bike route on our web site for you to see in pictures.
Most important is the 1.9-mile in and out of the Reservoir. The road is rough with lots of little bumps.
I advise you to pay attention to the surface in this area particularly. (You will drive in on this portion
of the ride with your vehicle so check it out). Once you get on top of the Dam Road immediately turn
right and follow the white flour on the road before and after each major turn for the entire trip. Ride
for approximately 6 miles to the first traffic light at Castro Ranch Road. Make a right turn, go up
Castro Ranch road, over the top past newer homes and then you will fly downhill for 12 mile. At the
Y in the road make a right onto Alhambra Valley road. The next turn is about 2.5 miles away.
Make a right onto Bear Creek road and bike all the way over the Bears until you have a very steep
short climb (you will remember this one). There at the top will be your second traffic light. Make
another right onto San Pablo Dam Road (you are making a big circle on this route). Go downhill for
34 of a mile and turn right back into the Reservoir for 1.9 miles. Heads up, BAD, ROUGH, ROAD.
You will want to fly because your bike ride is basically over. There could be people going and coming
with their (fishing) boats from the boat-launch ramp watch for them. Ride to the transition area.
Dismount before the dismount line; rack your bike then run out of the back end of the transition. Long
Course Du Bikers you are doing 2 loops. After the first loop do not come back to the transition area.
When you get back to the park entrance just continue down the road and do your 2nd loop before
coming back inside. We will have a Water Bottle exchange at the intersection of Bear Creek Road
and San Pablo Dam Road. You must throw a bottle to get a bottle. Thats how we know you want
Du 2nd Run:
2nd Run Short and Long course Duathletes after getting off the bike leave the transition and go up the
hill (there will be people there to guide you) and run up to the trail that you ran on the first run. Make
a right and run to the Short Course turnaround. The Long Course Duathletes will go by this turn
around and aid station to the Long Course turnaround which is the same as it was for the first run.
Check out the transition maps and you will see the direction of the flow.
Short Course - 1st Run
Short Course - Bike Route (1 Loop)
Short Course - 2nd Run
Short Course Transitions
Bike Route in Pictures
Bike Route Elevation Chart
Long Course - 1st Run
Long Course - Bike Route (2 Loops)
Long Course - 2nd Run
Long Course Transitions
Run Route Pictures