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Ross Dam and Diablo Lake Trail route map
Difficulty: ExpertOut and Back

Ross Dam and Diablo Lake Trail

Marblemount, Washington

12.8 mi

Distance

5,105 ft

Elev. Gain

5h 42m

Est. Time

Out & Back

Route Type

Expert

Difficulty

About This Trail

Ross Dam and Diablo Lake Trail is an out-and-back trail in North Cascades National Park, managed by the United States Forest Service, in Whatcom County, Washington. It is 13 miles long. The nearest town is Marblemount, Washington, about 20 miles away in a straight line.

From the trail data on this page.

Trail Conditions

Trail Conditions

Unknown

We have no current condition data for this trail. Check with the operator before you go, and submit a report below if you've been recently.

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Elevation Profile

Min:371 ft
Max:652 ft
Gain:1,556 ft
Loss:1,556 ft
Elevation profileA line rising and falling between 371 ft and 652 ft across 12.8 mi along the route, drawn from start to end.371 ft465 ft558 ft652 ft0.0 mi3.2 mi6.4 mi9.6 mi12.8 mi

Elevation at the labelled points along this route
PointDistance from startElevation
Start0.0 mi651 ft
High point12.8 mi652 ft
End12.8 mi651 ft

Trail Details

Route Type
Out & Back

Official sources & verification

Managed by United States Forest Service

Verify before you go

Where it is

Nearest town:
Marblemount, WA · about 20 mi away
County:
Whatcom County, WA
Jurisdiction:
North Cascades National Park · United States Forest Service

Nearest town and county from U.S. Census Bureau place records and county boundaries.

We display cached information from agency feeds. Hours, fees, permits, closures, fire restrictions, and conditions change without notice. Outdoors is not the permitting authority. Confirm current conditions for this trail using the links above before you go — you are responsible for compliance. Last verified by us: May 23, 2026. Our copy is more than a month old — please reconfirm with the agency before relying on it.Spot an error in our data?

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Legacy import — verify before navigating

Path geometry came from our pre-launch legacy database. Routes have not yet been re-verified against the operator and may differ from the actual trail.

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