Arrowhead Lake
Lake · 9,685 ft · Mammoth Lakes corridor
Arrowhead Lake sits at 9,685 feet in the Mammoth Lakes corridor, a glacially-carved alpine basin ringed by steep terrain. Wind and avalanche exposure define the place; shelter comes early, hazard comes fast.
Wind funnels off the lake by mid-afternoon, often exceeding 12 mph average. Morning calm is the rule; plan for blown-out conditions after 11 a.m. Avalanche terrain flanks the basin; assess snowpack stability before winter approach. Spring melt can trap you on either side of the outlet.
Over the last 30 days, Arrowhead Lake averaged 12 mph wind and a NoGo Score of 36, with gusts reaching 31 mph. Conditions have been marginal for paddling and exposure-sensitive travel throughout late spring. The week ahead shows typical high-Sierra volatility; calm mornings remain your window, but afternoon wind is nearly certain.
30 days back / 7 days forward
Today's score by factor
About Arrowhead Lake
Arrowhead Lake occupies a tight cirque basin in the high Sierra east of the Mammoth Lakes town corridor. Access is via the Mammoth Lakes gateway off Highway 395; from town, drive west toward the Lakes Basin. The lake sits in avalanche terrain with steep headwalls on three sides. Summer approach is straightforward via standard Sierra trails; winter approach requires avalanche awareness and stable snowpack. Base popularity is low (0.25), so crowds are minimal except on extended weekends after Highway 120 opens.
The 30-day rolling average temperature of 31 degrees Fahrenheit reflects late-spring conditions at 9,685 feet elevation. Wind averages 12 mph but spikes to 31 mph, creating a volatile window. Crowding averages 4 on a scale where 1 is empty and 10 is packed, holding steady through spring as fewer visitors venture to high-elevation lakes. Late September through early October offers the most stable window: water is warmest, snow has melted off the approach, and afternoon wind is less violent than spring. Winter snowpack is substantial; assess stability before any winter approach, especially on slopes feeding the basin.
Arrowhead Lake suits paddlers, hikers, and photographers who can start early and clear the lake before noon wind. Anglers find the lake less crowded than Crowley or Mammoth Lake proper but colder (high elevation, shade). Day hikers use it as a basecamp to explore adjacent peaks and drainage terrain. The steep walls make overnight camping risky when snowpack is unstable or wet-slab avalanche hazard exists. Experienced backcountry visitors plan parking in the Lakes Basin and hike in; parking fills quickly on weekend mornings.
Arrowhead Lake pairs with nearby Mammoth Lake and the Crowley Lake system for a multi-lake trip; Arrowhead is notably colder and less developed. Compared to the open water east of the Sierra crest, Arrowhead is sheltered and calmer in morning hours but more prone to afternoon wind funneling. The Eastern Sierra Avalanche Center (ESAC) rates terrain in this zone; check daily reports before winter or spring travel. Elevation (9,685 feet) limits the season to roughly late May through October for standard access; snow closure and avalanche hazard dominate November through April.