Mosquito Ridge Road

Distance: 50 miles out and back
Elevation gain: 6500 ft

Best of the Best ride

(Note 9/22: In 9/22 the Mosquito Fire burned a large area with this ride at its very center.  I haven’t seen the damage, but the flora must be devastated.  Of course the rock formations and road contour will still be there.  jr)

This is another ride suggested by Friend of Bestrides Brian—thanks again, man.

This is one of the prettiest mountain rides in Bestrides.  For the first 22 miles, you’re treated to views of a large river canyon on one side of the road and stunning multi-colored rock walls on the other.  If you’re a rock lover, this and the Kings Canyon ride will be your favorite rides, ever.  And the road is one continuous lazy serpentine—downhill, it’s 25 miles of buttery-smooth slalom course.  The only thing that keeps it from being the ride of your life is that it’s also 25 miles of almost unvaried, fairly monotonous 4-6% climbing—never difficult, but a bit tedious.  Luckily you can take your mind off the monotony any time by looking at the scenery on either side of you.  No distractions here—no inns, no houses, no waterfalls—just you, the road, and the canyon.

A reader tells me that the end of this route before the turn-around is unplowed in winter (should there ever be snow again).

(To see an interactive version of the map/elevation profile, click on the ride name, upper left, wait for the new map to load, then click on the “full screen” icon, upper right.)

The route couldn’t be simpler: from downtown Foresthill, CA, a small ridge-top mountain town with all the amenities, ride down Mosquito Ridge Road to the turn-off to Big Trees Grove.  Turn around and ride back.

Out of the gate you plunge into a joyous, easy 9-mile descent from the top of the ridge to the bottom of the American River canyon, with open views of the majestic canyon on your R and more and more colorful rock walls—red, blue, purple, yellow, gold, black—on your L.  The scenery will steadily improve for the next 14 miles.   The pitch is a consistent 4%, good for a descending speed of around 24 mph and mellow enough that you needn’t dread the climb back out.CIMG1073

Cross the big steel bridge over the river.  Now you climb, without interruption, until the turn-around point, at a slightly steeper pitch than what you just came down—5-6%, which will give you a sweet 30-mph descent when you turn around.  At 11 miles in, you reach a junction with a smaller road, named Blacksmith Flat Road (signed with a number, FR 23, but no name—there’s a sign on Mosquito Ridge Rd with the name after the turn-off, so you’ll see it when you’re returning), on the R.  If you take the southern loop option discussed under Adding Miles, you close the loop here, or go R onto 23 if you’re going counterclockwise.  But we aren’t doing that today.

CIMG1039Keep climbing up the south wall of the canyon, as the canyon vistas get grander and the rock walls get more varied and colorful.  The best scenery is from around 12 miles in to 14 miles in, so if you’re out for a shorter day try to make it that far, or drive to the bridge and start there.  At about 17 miles in, you reach the top of the ridge, swing R, cross the ridge into the canyon to the south, and ride along the northern wall of the new canyon.  The varicolored rock displays are all behind you, but the new canyon is, if anything, grander than the first one.

About 21 miles in, you ride out of the canyon and into standard prime Sierra forest, no better or worse than any other pristine Northern California woods, and the pitch shallows to imperceptible climbing.    Feel free to turn around—you won’t miss anything wonderful if you do.  Pass the oddly named Interbay Rd on the R and in a few miles you’ll be at Big Trees Grove.  The Grove has some nice giant sequoias, but you have to hike a 1/2-mile trail to see them, so unless you brought walking shoes there is little point in riding the 1/2-mile (paved) road to the picnic area, unless you need a drinking fountain or a bathroom—there’s one of each (but see Afterthoughts below).

Rock lover's paradise

Rock lover’s paradise

Turn around and ride home.  Soon you will notice something about the road contour if you didn’t notice it on your descent to the bridge: you don’t need brakes.  There are no hairpins.  Every curve, with the exception of one obvious 180 at 11 miles in, is rounded and lazy, so you never need to scrub speed.   You can ride from Big Trees to the bridge—15+ miles—and never drop much below 30 mph (minding that one corner).  You don’t have to brake, you don’t have to pedal if you don’t want to, you never speed up or slow down much—you just sit there, leaning the bike from side to side, carving esses.  Dreamy.

There’s a reason for this.  The road was built for logging, so it’s wide (for a two-lane), smooth, gentle of pitch, and lacking tight corners that would slow a logging truck down.  The downside of all this is that, while the road is almost without other traffic, you may meet loaded logging trucks and other large equipment.   But the road is roomy, the sightlines are good, and you can hear the trucks coming, so they aren’t a problem here, though having one pass you on the 10-mile climb back to your car, where the road can be narrower, does elevate the heart rate a bit.

Back at the bridge, you’re looking at 9+ miles of climbing, and if you’re tired that can seem daunting.  But it’s not bad.  It’s never more than 4%, so you can maintain 6+ mph even with tired legs, there are no soul-crushing straightaways, the rock walls are a constantly entertaining distraction, and there’s a sweet 1-mile descent right where you need it most, halfway up.  The whole thing won’t take more than 80 minutes of leisurely spinning.

Shortening the route: The best scenery is around 12-14 miles in, so plan to go that far or drive to the bridge and start there.

Photo by Brian

Photo by Brian

Adding miles: If you want to ride on past Big Trees there is no reason not to.  Eleven miles further down the road is French Meadows Reservoir.  You can ride there and turn around, or you can do either of two loops, both more challenging that the ride I’ve mapped out here.  Loop 1 forks L a few miles after Big Trees Grove and takes Road 43, Robinson Flat Rd, which was or is largely dirt, until it runs back into Foresthill Rd, which you no doubt took to get to the town of Foresthill.  Just go L and follow Foresthill Rd west back to town and your car.

Loop 2 is tougher.  Ride to French Meadows Reservoir, cross the dam, and immediately turn R at the fork onto French Meadows Rd.  Follow it through some name changes back to its intersection with Mosquito Ridge Rd (by which time it’s named Blacksmith Flat Road, or Rd 23), which you passed 11 miles into your ride.   Go L and return on Mosquito Ridge Rd to your car.  This is a long, demanding ride with some fierce climbing, and is often done counterclockwise to cash in on that 15-mile descent after Big Trees.  The good folks of the Sierra Foothills Cycling Club have provided a detailed ride log.

You are a few car miles down the road from the back door to the Iowa Hill Road ride, and if you want more miles after any one of these three options, my hat’s off to you.

Afterthoughts:  Plan your water carefully on this ride, especially if you’re doing one of the bigger loops.  There are only two water sources, Big Trees Grove at our turn-around and French Meadows Reservoir 11 miles further on, and both taps are shut down off-season.   I take a third water bottle and drop it at the bridge for the return climb, but even this would be inadequate on a hot summer day.

11 thoughts on “Mosquito Ridge Road

  1. krooferbike

    Road the ride today, great. I did the 1/2 mile to the Big Trees. The bathrooms and water fountain were closed or off, the sign said, “For the Season”. Hopefully they will be up and working soon.

  2. velocurean_m

    Did this ride yesterday and the water at Big Trees was open and it was so good. And thank goodness. Nearly 100 degrees at base of climb and I only took 2 water bottles. Next time will do the “stash” like Jay recommended.

  3. Matt

    Did this ride this week and it’s truly fantastic, great views, great climbing, and you’re practically the only person out there for miles and miles, particularly now that the road is closed to traffic at mile marker 7. Just grab some nutrition and water and go for it– you can turn around at any point because it’s all downhill on the way back. Also BE FOREWARNED: do not ride Interbay Road unless you are an elite rider looking to punish yourself! There’s a reason that area at the bottom of the canyon is named End of the World on Google Maps; it’s about a 5 mile climb out of there at grades above 20%.

  4. Jack Rawlins Post author

    Interbay Road is on your right on the ride out, left on the ride back. The ride is most definitely NOT all downhill on the way back, unless you start at the bridge.

  5. Jason

    Me and my buddies ride Mosquito Ridge Road almost every weekend (on motorcycles).
    Sunday 6-4-17 was almost my last ride. At 7.6 miles (exactly) down from Foresthill Road, a truck coming around the corner in my lane caused me to launch off a cliff on a very hard left-hand corner. I remember having enough time in the air to get really scared about “How high is this drop, and what is gong to stop me?” I got very, very lucky to walk away mostly uninjured.
    There are people this happens to who aren’t found for days. Moral of my story: this is a great road, still my favorite road. There are over 600 corners in 36 miles between Foresthill Road and French Meadows Reservoir with no driveways or cross streets to worry about. BUT there is getting to be more and more traffic up there and assholes don’t stay in their lane while driving. RESPECT THIS ROAD.

  6. Ralph

    It’s almost all downhill to Auburn once you are at Foresthill. I had someone drop me at the bridge where I hid water, rode to the top of the hill, then rode back to Auburn. This was the right-sized route for me, a 120-mile/8-14k-ish elv./per week rider.

  7. Zoe Winters

    Amazing ride! No traffic, stunning views, and incredible rock formations. I started at 9:00 am, and the high for the day was 84 degrees, so it was perfect, because I finished up by 12:30. I would not attempt this ride on a hot day!

  8. Doug Crabtree

    Did the Robinson Flat to Foresthill Road option from the Adding Miles section today. Also went to Oxbow, French Meadows, and Michigan Bluff to get to 10,000 feet of climbing in 83 miles. Robinson Flat is dirt but was OK on my 27mm street tires. There were a couple of spots where it got steep and I couldn’t get traction so I had to walk—maybe 100 yards of walking total. There’s a hand pump well at Robinson Flat and the water is excellent!
    This is such a great area. I was passed by 10 vehicles (including 5 water company pickups in a row) in the first 70 miles. It wasn’t until I neared Foresthill at the very end that I started seeing cars.

  9. David

    Excellent ride—classic, beautiful Sierras and a great descent. I went to French Meadows Reservoir. I do think it’s worth it for two reasons: (1) the descent from the intersection with Robinson Flat Road to Duncan Creek is fun and a touch more challenging at the bottom third than Mosquito Ridge, and (2) French Meadows Reservoir is somewhat scenic. However, it does add 2K of climbing round-trip.

    There was not much traffic, but just enough on a Thursday for me to be a touch cautious on the descents and watch the blind corners. Maybe 3 dozen cars and trucks from Foresthill to French Meadows Reservoir and back?

    Water is an issue. I took a gallon of water, in bottles and a hydration backpack, in mid-July, and it was just enough to endure the final climb back to Foresthill. In the AM, the starting temps were mid 70s and about 85 when I got to French Meadows. It was around 1pm at the base of the final climb and high 90s, and the climb is exposed in the afternoon. I finished all the water mid-climb and was mildly dehydrated at the end. The ultra-dry air, heat, and sun just suck the water away. My Garmin suggested I was a quart shy of ideal.

  10. John Maddux

    I rode this route today June 25, 2022. The MRR ride was as beautiful and pleasant as described. Did the Robinson Flat Road dirt to Foresthill loop back to Auburn. I agree with prior comments that RFR is steep and loose in sections but I made it on 32C tires on my Trek Domane. Foresthill Road is mostly through a burned area and thus not forested or shady, so I was glad to be going downhill on this hot day.

    One note of caution on the traffic … the last Saturday in June is the Western States Endurance Run and this brings lots of traffic on both MRR and Foresthill Rd. But it was fun to see the runners on RFR (starting around 9:30am) and the circus environment of the aid station at Robinson Flat.

  11. R

    I descended Mosquito Ridge in July of 2022 and found the water shut off at Big Trees Grove. Road condition was impeccable, definitely a memorable ride.


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