this has been a popular riding spot for YEARS. then, they built houses in half of the riding area then proceded to ban bicycles and close trails that riders built 15 years ago.
that being said, here is a map http://www.ci.walnut-creek.ca.us/pdf/map.lime%20ridge.pdf
the last time i rode there rangers had made their presence known. the most popular singletrack full of switchbacks and big berms (called mach 5) had been destroyed - large rocks placed in the middle and shrubbery had been uprooted and layed across the trail. such a shame, this was the trail that really got me into riding.
i used to live nearby, so i would ride there and do the paradise valley trail to ridge trail loop then head out. mach 5 starts at the water tower on the ridge trail. paradise valley is good to come down also, real smooth with lots of switchbacks. buckeye trail and manzanita trail are fire trails but have some tricky spots with rock gardens and gets pretty steep in a few spots.
also if you follow blue oak trail to where it meets at ohlone trail, there is a real tight singletrack there too. its not very long but it snakes through the trees and is super fun to ride fast. then you can ride through the tunnel that goes under ygnacio. on the other side of the road there is not much going on, just firetrails. watch out for hikers, i got yelled at for "scaring off the mountain lions" ??? yeah right, like they are going to come up to you and let you pet them.....
 | Berm Trail |    | 2 mi |
The area is scorched from fires earlier this year, the trail needs work but I believe the powers that be frown upon this particular trail... probably because its fun to ride. The dirt was sticky/tacky when I went and it made for tough climbing to the top. The trail itself is a blast and It's a shame there aren't more like it in the area.
| ThankThis is a nice, short 5 mi out and back on mostly single track that's technically for hiking only, but has more bike tracks than shoe prints. There are alot of other hidden trails too but the main trail to the top of Lime Ridge and the Lime Ridge Trail is relatively smooth with some banked turns. Not recommended in the heat of a summer day since it can easily get 95 . I was out on an early sunday morn and saw a few other Mtb riders but no hikers on the trail.
| ThankI use Lime Ridge as much as I can, Awesome trails,Very close to my house ,and If you want the best ride go out on Sunday afternoon when a big game is on. Need to ride this area about a dozen times to find all the great spots hidden from the world.
| ThankThe entrance next to the tunnel beneath ygnacio is just down the street from my house so I bike from there often. There is really only one bikable way to go up from there for an Intermediate level climber. I have a 6 mile trail I have started to do a few times a week back through there. Once you get to the top there are a ton of different ways to get down ranging from the ski equivelent of beginner to double black diamond really a ton of fun. People do horseback on some of the wider trails that make some stretches pretty bumpy but its stilll a good trail. If you are within 30 minutes of here, I'd say its worth a go.
| ThankThe entrance next to the tunnel beneath ygnacio is just down the street from my house so I bike from there often. There is really only one bikable way to go up from there for an Intermediate level climber. I have a 6 mile trail I have started to do a few times a week back through there. Once you get to the top there are a ton of different ways to get down ranging from the ski equivelent of beginner to double black diamond really a ton of fun. People do horseback on some of the wider trails that make some stretches pretty bumpy but its stilll a good trail. If you are within 30 minutes of here, I'd say its worth a go.
| ThankThat is my favorite part off mount bike because you keep blowing the area there is one rocky area on the top of the hill if you call straight down Amy's look like real good to come down but anyway it's fun to be there great workout and I love the place and I keep going
| ThankRide Lime Ridge a lot. Stopped riding this particular trail due to the rangers that hangout at the bottom of the route handing out tickets. You'd think they'd be interested more in the vandals and perps breaking into cars in the parking lot. Too bad cause this run is pretty fun especially when coming down from the peak above the water storage tower.
| ThankWell guys, I hate to say it but yet again another single track has fallen for us mtn. bikers. The hikers yet again win territory. Why can't we just all get along??? Not too long ago, a ranger told me that most of the trails are banned to riders. He said we could only ride trails greater than 8 ft. Anything less than 3 feet is off limits. What??? That's the fun singletracks you spoiler!!! Its really sucks. Then, on a separate occassion, a ranger volunteer threatned me by saying that he would report me to the rangers. Man, not only are we banned from being there, but our adversaries are doing their best to keep us off. As I was riding up a trail, I saw something shining on the ground. I stopped to see what it was. Guess what it was. 8 frickin nails nailed upside down in the sand/dirt!!! Not only is this messed up, but someones in soft shoes could hurt themselves. I hardly go there anymore for that reason.
| ThankRanger Rick is out in force lately. Me and 2 riding pals nearly got $300+ tickets for riding the single tracks. Bikes are only allowed on the fire-roads and they are starting to hand out tickets. If you are going to ride the single track, be careful!* Review edited 6/29/2009
| Thankbeen riding here a lot lately, great place to go and explore to find some jumps, good fast single tracks and few spots with some technical sections (need to explore to find) There is some stuff here for everyone.
| ThankI've ridden here a few times in that past month and has been pretty decent riding. The single track that starts on the west side at the top of the hill is pretty fun and there is still some jumps lingering around that can be hit if you're willing to explore
| ThankThis trail doesn't exist as described. There is certainly Lime Ridge open space that straddles Concord and Walnut Creek, but no MooMoo hill per se. Lime ridge South has more Oak Trees and growth, nothing spectacular nor technical in any manner. North Side of Ygnacio Valley Rd is exposed wind swept grass land
| Thankthe fire trails here are still legal
| Thankgrammer aside, this is a great place to ride. but it is called mach 5 and it is in lime ridge. i rode there about a year ago and rangers have really locked that place down. starting seeing a lot of rangers patrolling, and they put boulders in the middle of the trail as well as uprooting bushes and laying them on the trail. rangers do more destruction than we do...
| ThankI'd like to try this out, but from your directions I'm not sure where it is...
| Thank