The Grouse Ridge loop is the full-day hike in Tahoe National Forest's Gold Lakes Basin that rewards commitment. The route climbs to a 1923 fire lookout with 360-degree views at 7,707 feet, then descends through a chain of alpine lakes set in open granite terrain. Milk Lake, Island Lake, Long Lake, and Glacier Lake each have a different character, and the loop format means you approach each from a fresh angle rather than retracing your steps through the same scenery. Unlike the trailheads along I-80 and Alpine Meadows Road, getting here requires driving a Forest Service dirt road for a few miles, which keeps the casual traffic away. This is one of the better all-day options in Tahoe National Forest for hikers who want real mileage, real lake country, and a reasonable chance of not sharing a lunch spot with twenty other parties.
Trail Overview
The loop is 10.1 miles with 1,633 feet of elevation gain. The trail starts at about 7,300 feet at the Grouse Ridge trailhead, climbs briefly to the lookout at 7,707 feet, then descends through the lake basin before looping back up to the trailhead. This is more of a "rolling ridgeline" route than a sustained climb: elevation gain is distributed across the whole loop rather than front-loaded. Plan 5 to 6 hours for the full loop, including time at the lakes.
Getting to the Trailhead
From I-80, take exit 161 for Highway 20 (toward Marysville). Drive Highway 20 west about 4.5 miles to Bowman Lake Road (Forest Road 18), on the right. Turn right and follow Bowman Lake Road north for approximately 8 miles. The road is paved for the first few miles and transitions to packed gravel. At the junction with Grouse Ridge Road, turn right. Drive another 3 miles on rougher unpaved road to the trailhead.
The last section of Grouse Ridge Road is passable by passenger cars in dry conditions but is genuinely rough. High-clearance vehicles are more comfortable. In early season, sections of this road may be soft or have downed trees. Call the Nevada City ranger district for current road conditions before your trip: (530) 265-4531.
GPS coordinates for the trailhead: 39.3833, -120.6150. No cell service at the trailhead.
The Route
Miles 0 to 0.7 (trailhead to Grouse Ridge Lookout): The trail begins at the parking area and climbs steadily through open granite and scattered pine to the Grouse Ridge Lookout at 7,707 feet. This is the highest point on the loop. The lookout tower, built in 1923, is a rustic wood structure that is no longer staffed but still stands intact. The views from the base of the tower take in the entire Gold Lakes Basin to the west and south: dozens of lakes visible in the granite landscape spreading out below you.
Miles 0.7 to 3.5 (lookout to Island Lake): The trail descends from the lookout through open granite and patches of lodgepole pine. You'll reach Milk Lake at about mile 2, a small but attractive lake with granite boulders breaking the shoreline. The trail continues to Island Lake at mile 3.5, the scenic centerpiece of the loop. Island Lake has a small rocky island visible from the main trail and good spots to stop for lunch on the north shore.
Miles 3.5 to 6.5 (Island Lake to Glacier Lake): The trail continues through open terrain past Long Lake (mile 5), the largest lake on the loop and a popular fishing destination. Long Lake is big enough that the far shore is not visible from the trail, which gives it an unusual sense of scale for this elevation. Glacier Lake at mile 6.5 is the most remote of the four lakes, tucked into the far end of the basin. Fewer hikers reach it, and the camping here is more secluded than at Island and Long Lakes.
Miles 6.5 to 10.1 (Glacier Lake back to trailhead): The loop closes by climbing back up through granite terrain and returning to the ridgeline east of the lookout, then descending to the trailhead. This section has the most sustained climbing of the return segment: expect about 600 feet of gain spread over 3 miles.
When to Visit
July: The trail typically opens in early to mid-July after snowmelt. Wildflowers are at their best in July around the lake margins. Mosquitoes can be very heavy through mid-July near the lakes.
August through early September: Prime season. Mosquitoes thin, days are long, and the lakes are at their most inviting. Afternoon thunderstorms are possible. Start early to finish the 10-mile loop before afternoon.
Late September and October: Good for solitude. Colors change in the willows and aspens around the lower lakes. Temperatures drop at night, and frost is possible in the basin. The trail is typically clear until first major snowfall.
What to Bring
- Water: Many hikers carry 3 or more liters per person for a full day given 5 to 6 hours of exertion. The lakes require filtration. Individual hydration needs vary based on body weight, pace, and temperature.
- Snacks and lunch: A full meal is appropriate for a 10-mile loop. Eat at Island Lake or Long Lake.
- Layers: Despite summer temperatures, evening can arrive quickly in the basin. If you're camping, bring warm layers.
- Bug protection: Through July, mosquitoes around the lakes are intense. DEET or picaridin in an effective concentration.
- Navigation: Download the trail map offline before leaving cell service. The loop has a few junctions where wrong turns are possible.
Practical Details
Trailhead: Grouse Ridge trailhead at the end of Grouse Ridge Road, accessed via Bowman Lake Road off Highway 20. Unpaved parking area with no vault toilet or water. Free.
Parking: About 20 vehicles. Rarely fills except on peak August weekends.
Dogs: Permitted on-leash throughout. The terrain is manageable for dogs. Carry water for your dog; the lakes are filtered sources.
Permits: None required. California Campfire Permit required for stove or fire use outside developed areas.
Cell Service: None at the trailhead or on the trail.
Getting There
From Sacramento, take I-80 east to exit 161 (Highway 20). Drive west on Highway 20 about 4.5 miles, turn right on Bowman Lake Road, and follow directions above. Total distance from Sacramento: about 110 miles, approximately 2 hours including the Forest Service road.
From Truckee, take I-80 west about 20 miles to exit 161. Follow the same directions. From Truckee: about 35 miles, 50 minutes.
Beyond Grouse Ridge
The Gold Lakes Basin extends south and west of the Grouse Ridge loop. From Island Lake, it's possible to hike cross-country or on use trails toward Sand Ridge and the Five Lakes Basin for a much longer route. This is off-trail navigation territory.
The Round Lake trail from Carr Lake provides an easy complement to this hike: if Grouse Ridge is your strenuous day, Round Lake is an easy recovery walk the next morning in the same general area of California's northern Sierra. For anyone planning an overnight trip, the national forest camping permit guide covers the basics for backcountry camping logistics.