Images

Storm runoff deposited mud, gravel, and small boulders onto Lower Dry Fork Road which runs below the steep watersheds burned by the 2024 Elk Fire near Dayton, Wyoming.

A view looking upslope toward the burned hillsides below Dry Fork Ridge in the Bighorn National Forest within the 2024 Elk Fire burn area.

Overview map and location of the Tracy Arm landslide-generated tsunami event. The imagery is not current, and the South Sawyer Glacier has retreated over a kilometer from what is depicted. 

Oblique aerial photo of the August 10, 2025 landslide source area captured during a field reconnaissance overflight on August 13, 2025. Look direction is approximately north.​

Oblique aerial photo of Sawyer Island captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the southeast.​

Oblique aerial photo of the August 10, 2025 landslide captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the west.​

Photo of tsunami-inundated shoreline at Williams Cove, near the mouth of Tracy Arm. Look direction is approximately north.​

Oblique aerial photo of the August 10, 2025 landslide headscarp. Look direction is to the northwest.​

Oblique aerial photo of the August 10, 2025 landslide, and tsunami trimline, captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the northwest.​

Oblique aerial photo of the August 10, 2025 landslide. Look direction is to the south.​

Oblique aerial photo of the August 10, 2025 landslide and South Sawyer Glacier captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the southeast.​

Oblique aerial photo of the August 10, 2025 landslide source area captured during a field reconnaissance overflight on August 13, 2025. Look direction is approximately north.​

Comparison of (a) pre- and (b) post-event satellite images showing the source area of the August 10th landslide that impacted Tracy Arm. The dashed line in (a) shows the approximate location of the front of South Sawyer Glacier on August 7th, 2025 (mapped from imagery © 2025 Planet Labs PBC).

Oblique aerial photo of the August 10, 2025 landslide taken from across the fiord during a field reconnaissance overflight on August 13, 2025. Look direction is approximately north.​

Oblique aerial photo of the August 10, 2025 landslide across-fiord runup zone and South Sawyer Glacier captured during a field reconnaissance overflight on August 13, 2025. Look direction is to the southeast.​

Debris-flow deposit in the 2024 Elk Fire burn area near Dayton, Wyoming is comprised of poorly sorted, mud- to boulder-sized sediment. A small amount of woody debris is intermixed with the sediment that fills channel.

The bark at the base of a tree in a burned watershed in the 2024 Ek Fire burn area has been partially removed by fast-moving water and debris. This damage occurs as debris flows pass through the channel and sediment suspended in the flow scrapes bark off of trees.

Runoff during a 2025 summer thunderstorm carried material downstream in this relatively small channel in the High Water Creek watershed within the Elk Fire burn area.

Runoff in the 2024 Elk Fire burn area. This meadow near a watershed outlet along Lower Dry Fork Road shows a shallow channel formed during Summer 2025. Although vegetation is recovering, runoff deposited mud and flattened grasses in this low-slope area.

Sediment transported by storm runoff was deposited in this small channel draining from Dry Fork Ridge in the Elk Fire burn area. The deposit includes a mix of woody debris, gravel, cobbles, and finer material typical of flood or debris-flow processes.

Burned trees and loose material cover a burned hillslope in 2024 Elk Fire burn area near Dayton, Wyoming. Rills, in the foreground formed from rainfall running off the ground surface. New green vegetation shows early signs of postfire recovery.