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Black Diamond Mines

Average Rating:    (3.93 of 5)

No. of Reviews: 15

Several different styles of trails including "The Wall" The park system is too large to really get deep into it. There is a trail for every type of rider. I am an intermediate rider and love the trails in the spring and fall. Summers are too damn hot and dry. Winter the roads are destroyed by cattle. The trails are mostly clay and we just love cleaning that crap off our bikes! You also can go Black diamonds over a ridge and go thru Clayton to get to the ultimate climb Mitchell Canyon!
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Latitude
37.96368875328558
Longitude
-121.90567016601562
Trail Directions
Highway 4 to Somersville Rd. South exit, go approx 4 miles into the hills.
Trail Length
5-20 miles with loops
Trail Level
Advanced
Trail Type
Singletrack & Fire Roads
City/County
Antioch
   


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Reviews 1 - 5 (15 Reviews Total) View All | Next 5

Review Date
June 24, 2013

Overall Rating
 5 of 5

Aerobic Difficulty
 3 of 5

Technical Difficulty
 4 of 5

Ridden Trail:
Once a week

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5.00 of 5, 1.00 votes

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Reviewed by: Wiplash ,  Cross Country Rider

Summary:
Great trails for beginner to intermediate riders. I ride these trails about twice a week.

Other recommended trails in the same area:
I like the Stewartville trail



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Review Date
July 31, 2012

Overall Rating
 3 of 5

Aerobic Difficulty
 5 of 5

Technical Difficulty
 2 of 5

Ridden Trail:
Once a week

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5.00 of 5, 1.00 votes

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Reviewed by: The Grouch ,  Weekend Warrior

Summary:
Like everyone else already said , fireroads that never seem to stop, and no shade. So bring lots of water in the summer months. A good place to train but don't waste your time making a special trip out here.

Recommended Route:
I think you should try and ride up the wall to test your skills.



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Review Date
June 28, 2012

Overall Rating
 4 of 5

Aerobic Difficulty
 4 of 5

Technical Difficulty
 3 of 5

Ridden Trail:
Once a week

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5.00 of 5, 2.00 votes

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Reviewed by: Dirttrackin280h ,  Weekend Warrior

Summary:
As others have mentioned this place is a good workout to build stamina and strength on those long steep climbs. You can piece together a pretty fun loop with some single track once you know your way around the preserve. When I first rode this place years ago, I used to have to walk most of the hills here, now I can officially say I can clear anything and everything...on a 33lb. 6" full suspension bike!
There's always a fair amount of cars parked in the Frederickson staging area but since the place is big, people are spread out. I think most people park there and walk into Contra Loma since it's free to park.
During the winter months the trails are pretty damaged due to the cattle. Spring time is your best bet for smooth trails and summer is nice if you can withstand the heat and dry dirt.

Recommended Route:
A nice loop with some single track is to start off at Frederickson Lane staging, take the Stewartville Trail (starts out as gravel) up the hill until you see Ridge Trail on the right side, climb Ridge trail (beginners you WILL walk it, it can be a tough climb) and take it all the way up until you see Corcoran Mine Trail which will be a quick left...this trail is legal to bikes. It may look single track because it doesn't get much use, but hold on because this can be a fast and rough downhill section. Very fun on a 6" full suspension bike. This is the most challenging and funnest trail for bikes in the preserve...So once you have taken Corcoran all the way to the bottom, there will be a "T", go right onto Stewartville Trail. Continue until you see Upper Oil Canyon Trail to your left. This is a nice climb, if you're a beginner you may find yourself walking it. Climb all the way to the top to where you will see a Oil Canyon Trail on the left. This is a nice quick single track section (bike's aren't legal, ride at your own risk!) that will loop you to Lower Oil Canyon Trail and then back onto Stewartville Trail back to Frederickson Lane to the car. There's many ways to change up the loop or to create others. There's a lot of trails!

Other recommended trails in the same area:
Mt. Diablo. Lime Ridge



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Review Date
July 26, 2009

Overall Rating
 5 of 5

Aerobic Difficulty
 5 of 5

Technical Difficulty
 3 of 5

Ridden Trail:
Once a week

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5.00 of 5, 1.00 votes

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Reviewed by: stepenliem ,  Cross Country Rider

Summary:
I live around this park and hit the trails there a few times a week. Other reviewers are right in saying that these trails are non technical (with the exception of Corcoran Mine trail), but they will test your endurance though. I have been to many mtb trails in the bay area including Santa Cruz, Marin, Mt Diablo, Tahoe, etc, I can definitely say that Black Diamond is the hardest in term of physical endurance. For those who complain that they are not challenging enough, I dare you to try this:
Go ride the trails between January and March when there are a lot of rains and the cows trampled all over the trails. Its extremely technical to go down or up on a trail that have millions of holes half a foot or even a foot deep. Riding Black Diamond during those months is like riding the surface of the moon. Oh.. did I mentioned that those holes are all sticky mud? I usually switch my tires from 2.1 to at least 2.35 inch to ride during the winter months. If you can complete any trail during those worst months, I will buy you a beer!!

Recommended Route:
Go up North Ridge from the Frederickson street entrance, all they way up to the very top. When you descend from the top, take a trail that go to your right, and then another right up. Go follow that trail, it will take you to a wild, long and the steepest descent in the park. That will take you back to the gate. Total distance: 5 miles. Bonus point: do this route in February after heavy rain!



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Review Date
April 28, 2007

Overall Rating
 4 of 5

Aerobic Difficulty
 4 of 5

Technical Difficulty
 2 of 5

Ridden Trail:
Once a week

Visitors rate this review
4.50 of 5, 2.00 votes

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Reviewed by: rockymtnrider ,  Weekend Warrior

Summary:
Black Diamond has a lot of different trails. You can ride as far as you want. You can do a short ride of about 10 miles or go trail to trail and you can ride over 25 miles. You can make the ride easy or reverse it and make it even more of a climb. It is a great park to build your skills and muscles. I could bearly ride a hill when I started and now I can ride strong. Still have to walk part of the wall.

I ride Black Diamond about 3 times a week. I live near it and I am so glad I do. I started mountain biking back in January.

Recommended Route:
Old home stead loop to acorn, down the ridge trail. Right onto stewartville trail. Ride it to the wall then up to ridge trail to acorn then left onto old homestead loop finishing the loop.

Other recommended trails in the same area:
Check the trail maps. You have endless number of options. You can ride to clayton from antioch if you have the stamina.



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Reviews 1 - 5 (15 Reviews Total) View All | Next 5