Distance: 21 miles one way
Elevation gain: 2835 ft
This is one of seven rides (all detailed in the Adding Miles section of the Mountain View Road ride) that are worth doing around Boonville, a charming little town with good food and an interesting history, so I encourage you to find a place to stay in the area, make a cycling holiday out of it, and do all of them.
This road parallels Mountain View Road, which is 5 miles to the south, and the two are similar. Both roads are isolated trips through standard coastal pine/redwood forest with a good dose of 8-10% climbing. This one is prettier and easier and has a much better road surface, and it makes for a shorter loop if you’re returning on Hwy 128, so if I was just doing one of the two I’d go with Philo-Greenwood unless I wanted a) a bigger climbing challenge, c) more Hwy 1 riding, or c) to visit Manchester. I’ve mapped the ride as one way because I assume you’ll want to return on 128, which is covered in the Mendocino/Comptche ride. The Philo-Greenwood/Cameron Road/Hwy 128 loop is 42 miles.
Begin riding at the intersection of Hwy 128 and Philo-Greenwood Road just north of Philo. The community of Philo is little more than an apple stand (Gowan’s Oak tree—worth a stop for the apple juice, can’t miss it), so you might want to ride from Boonville, 5 miles south of Philo, thus adding about 12 miles.
Head down PGR. In a half-mile or so you pass the turn-off to Hendy Woods State Park, a lovely stand of old-growth redwoods that charges a substantial fee. Immediately after, you begin a hard 4-mile climb, an unrelenting grind that averages 8% but is frequently 10-12%. Almost all of the hard work on the ride is right here, thought there are a few 8% rollers later on. The forest is very pretty—prettier, I think, than Mountain View Rd., though the fact that I rode it after a rainstorm may be the reason. Watch for glimpses of the Navarro River watershed through the trees on your right. Right after the very first little downhill, at 3.5 miles, Signal Ridge Rd. goes off to the L—consider riding it (see details in Adding Miles).
When the bulk of the climbing is over, roll up and down through more pretty woods with scattered farms to the intersection of PGR and Cameron Rd, 15.2 miles in. Here you have a clear choice. PGR plummets down to the sea (the intersection is exactly at the lip of the precipice, with a sign reading “10% grade (down) 2 miles”). Cameron, to the R, goes to the same ocean in almost twice the distance (5.6 miles vs. 2.5 miles) and thus is about half as steep. So stay on PGR if you want high drama and smoking brake pads, you want to see Elk (a tiny community with a good diner), or you want to ride the very nice stretch of Hwy 1 north to Hwy 128. Go right on Cameron if you want a relatively mellow and much straighter descent (15-25 mph). I’ve mapped it the mellow way. The road surface deteriorates as you approach the coast, which I think of as part of the Mendocino coastal area’s charms.
Cameron meets Hwy 1 about 1 mile south of the Navarro River bridge. Just south of the bridge, a paved road goes into Navarro Beach, a sweet patch of sand where the river flows into the sea. You’ll find interesting historical placards (it’s part of the Navarro Redwoods State Park), good sea stacks, and driftwood sculpture—well worth a detour.
Since PGR is a back-road alternative to the much faster, easier Hwy 128, the only traffic you’ll encounter are locals—1-2 cars per mile.
Shortening the route: Unless you cut PGR drastically short, you won’t save much by turning around, because Hwy 128 is much easier riding that returning on PGR. I’d opt for the full PGR/128 loop.
Adding mIles: I fully expect you to return to Philo via 128, whose praises are sung in the Mendocino/Comptche ride. If you want to make an epic out of it, ride south and return on Mountain View Rd. For other rides in the area, see Adding Miles in the Mountain View Road post.
Three and a half miles into our ride, Signal Ridge Rd. goes off to the L and goes 1.5 miles before turning to dirt. I know it’s just 3 miles out and back, but it is a precious three miles I strongly encourage you to do—a true one-lane road that dips and dives deliciously through gorgeous woods on its way to the few cabins that live up the road.