Spillway Campground
Open — Open year-round first-come, first-served with reduced off-season rates from October through April. Potable water is only available May through September; winter visitors must bring their own water. Winter access depends on snow conditions and road maintenance.
Wet weather trail closure in effect on Grindstone District
A wet weather closure is in effect for Stonyford OHV trails on the Grindstone Ranger District, as of 10am, Dec. 23. Trail closures go into effect when two inches of rainfall occur within a 24-hour period or when the soils are saturated.
Wet weather trail closure in effect on Upper Lake District
A wet weather closure will go in effect for OHV trails on the Upper Lake Ranger District, as of 8am on Dec. 20, 2025. Trail closures go into effect when two inches of rainfall occur within a 24-hour period or when the soils are saturated.
Stonyford Office Hours Changing
The Stonyford Office's visitor services hours are changing beginning Jan. 5, 2026. Starting next year, the office will be open from Monday-Friday and closed Saturday-Sunday. Office hours are 8:30-4pm with a lunch break 12-1pm.
M10 Road Construction
The M10 road will be closed Monday, Nov. 17- 20, 2025. Closure location is above Fouts Springs near Dixie Glade. Main impacts are to the Letts Lake basin on Grindstone Ranger District. Detour to get to Letts Lake is via the M5 and 17N02 Roads, high clearance vehicle recommended.
Trail 34 on Upper Lake District closed due to unsafe conditions
OHV Trail 34 is closed due to trail tread degradation and rutting that runs 300 feet down the trail. The trail is unsafe due to unstable soil, extremely muddy conditions and increased runoff.
Trail 3 on Grindstone closed due to slide
Trail 85303 (Trail 3) on the Grindstone Ranger District closed due to landslide: Trail 85303 is closed between Trail 85304 and M5 Road for public safety and to protect natural resources. Unstable soil, downed trees and a steep drop off make this trail unsafe for users.
Cedar Camp Campground Closure
Cedar Camp Campground is closed for public safety. Closure is in effect through 6/18/26.
Chico Seed Orchard Public Use and Access Closure
Pets must be on a leash. Fall/winter hours are 7 a.m. - 5 p.m. beginning Nov. 1. Spring/summer hours are 7 a.m. - 7 p.m. A closure is in effect outside of these hours.
About
Spillway Campground is one of four loops comprising Letts Lake Campground in the Mendocino National Forest's Stonyford Recreation Area, located 19 miles west of Stonyford at approximately 4,500 feet elevation. This loop contains 9 campsites numbered 34 through 42, each equipped with a fire ring and picnic table, situated among mature conifers and manzanita with some sites offering lake views. The centerpiece of the area is the 35-acre Letts Lake, which permits only non-motorized vessels and is stocked with trout. A one-mile trail encircles the lake, connecting the four campground loops. The recreation area features accessible vault restrooms and a popular fully-accessible fishing pier. Swimming is permitted in the lake during warmer months. The campground operates on a first-come, first-served basis only, with no advance reservations accepted. Check-in is at 2:00 p.m. and check-out at 11:00 a.m., with quiet hours from 10:00 p.m. to 6:00 a.m. A maximum of two vehicles are permitted per site, and OHV riding is not allowed in the campground. Payment can be made on-site via the Recreation.gov mobile app using Scan & Pay at the campground kiosk.
Directions
Located 19 miles west of Stonyford in the Mendocino National Forest. Access may be difficult in winter due to snow and ice conditions. High clearance vehicle recommended; four-wheel drive or chains may be required in winter.
Nearby Campgrounds
Amenities
| Water | Yes |
| Fires Allowed | Yes |
| Toilets | Yes |
| Dump Station | No |
| Wifi | No |
| Pets Allowed | — |
| Showers | No |
| Electric Hookups | — |
| Water Hookups | — |
| Sewer Hookups | — |
| Camp Store | No |
| Price | $6 - $12 |
Vehicle
| Max RV Length | — |
| Max Trailer Length | — |
| Big Rig Friendly | No |
| Pull Through Sites | No |
Contact
| sm.fs.mendopao@usda.gov | |
| Phone | +1 (530) 963-3128 |
Cell Service
| AT&T | None |
| Verizon | None |
| T-Mobile | None |
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