Eastern Brook Lakes
Lake · Mammoth Lakes corridor
Eastern Brook Lakes sits at 10,354 ft in the Mammoth Lakes corridor of the Sierra Nevada. High-elevation alpine lake with minimal crowds and consistent afternoon wind patterns.
Morning calm gives way to afternoon wind funneling off the lake by mid-day. The 30-day average wind of 15 mph masks gusts to 42 mph in the afternoon hours. Water remains cold year-round; plan for early starts if you're paddling or fishing.
Over the past 30 days, conditions averaged a 15.0 NoGo Score with temperatures holding at 19 degrees Fahrenheit and wind averaging 15 mph. The week ahead follows the seasonal pattern for this elevation: morning windows before wind rises in the afternoon. Check the rolling 7-day and 30-day trends below to pinpoint your best window.
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About Eastern Brook Lakes
Eastern Brook Lakes lies in the high Sierra backcountry of the Mammoth Lakes corridor, northeast of the town of Mammoth Lakes. The lake sits at 10,354 feet elevation, accessible via trails branching from the Mammoth Lakes Basin area. Access requires a drive to one of the Mammoth Lakes trailheads (typically 20 to 40 minutes from town depending on the specific entry). Highway 395 is the primary corridor to Mammoth; Highway 203 leads into the town and basin. The lake draws light traffic compared to heavily developed lakes in the region, making it a quieter choice for visitors seeking solitude at high elevation.
Eastern Brook Lakes experiences the full range of Sierra alpine weather. Winter temperatures plummet to 2 degrees Fahrenheit; summer peaks reach 33 degrees. Over the last 30 days, average temperature was 19 degrees with average wind of 15 mph, though gusts peak at 42 mph in afternoon hours. The lake is wind-exposed and sits on the rainshadow side of the crest, meaning it dries quickly after storms but also lies in the path of afternoon thermal wind. Crowding averages 4 on a scale of 1 to 10, remaining low even during peak season. Snow typically lingers into late June; plan for water-crossing hazards and muddy approaches in early season.
Eastern Brook Lakes suits backcountry anglers, alpine photographers, and minimalist campers who accept cold nights and exposure in exchange for isolation. Experienced hikers and scramamblers use the lake as a waypoint on longer traverses. The site is best for visitors comfortable at altitude and prepared for rapid weather shifts. Afternoon wind makes early morning the only reliable window for paddling or photography. Bring layers; temperature swings of 30 degrees from morning to afternoon are common. Parking at trailheads fills quickly on weekends during late summer; arrive by early morning or plan for mid-week visits.
Nearby alternatives include Blue Lakes (lower elevation, more sheltered) and Yosemite's high-country tarns (similar elevation but higher crowding during peak season). Eastern Brook Lakes occupies a middle ground: higher than most Mammoth Basin lakes but less trafficked than Yosemite's alpine destinations. The Mammoth corridor itself spans from Highway 395 south through town; Highway 120 crosses the Sierra to the east and connects to Tioga Pass, the primary summer access to Yosemite's eastern side.