slgwv's photos with the keyword: collapse

The Great Arch

The Great Arch

slgwv
22 Sep 2015 9 8 795
The name was not drawn from a hat! ;) Zion National Park, Utah, USA; pic taken from an overlook on the way to the Zion Tunnel on Utah State Route 9. These collapse arches are a common failure mode in the massive Navajo Sandstone as it's undermined by erosion. There is a trail to an overlook at the low point to the right of the arch. The trailhead is right by the eastern portal of the tunnel.
Drained Quail Creek reservoir.

Drained Quail Creek reservoir.

slgwv
26 Apr 2011 148
Quail Creek Reservoir.

Quail Creek Reservoir.

slgwv
26 Apr 2011 131
Partly drained!
Breached southeast dike.

Breached southeast dike.

slgwv
26 Apr 2011 196
Quail Creek Dam, looking along the dike to the southeast.
Breached southeast dike

Breached southeast dike

slgwv
26 Apr 2011 3 5 297
Quail Creek Dam, near St. George, Utah, USA. The southeast dike of the dam collapsed in the wee hours on New Year's Day, 1989, after being undermined due to gypsum in the country rock dissolving out. There were no injuries but a considerable amount of property damage. The dike has been rebuilt with a much better foundation.
Washed out bridge.

Washed out bridge.

slgwv
26 Apr 2011 150
From the Quail Creek dike collapse, wee hours of New Year's Day, 1989. Southern Utah, USA.
Washed out bridge.

Washed out bridge.

slgwv
26 Apr 2011 3 4 343
From the Quail Creek dike collapse, southern Utah, USA, in the wee hours of New Year's Day, 1989.