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INDEX OF PHOTOGRAPHS

Frontispiece . North Fork Toutle River, near Mount St. Helens, Washington, on debris-avalanche deposit.

Figure 1 . Mount St. Helens and deposits from debris avalanche in valley of the North Fork Toutle River, near Mount St. Helens, Washington, December 16, 1980.

Figure 2 . Volcanic debris flow ("lahar") in the Toutle River near Highway 99, near Mount, St. Helens, Washington during the May 18, 1980, eruption. Flow from upper right to lower left; time about 8:30 p.m.

Figure 4. Channel reach in vicinity of gaging stations on streams, near Mount St. Helens, Washington:

A, Green River above Beaver Creek, with view towards right bank, August 31, 1982 (photograph by W.P. Johnson);

B, Clearwater Creek near mouth, 1982, view downstream from gaging station (photograph by M.A. Uhrich).

Figure 5 . Stream-gaging cable car at the North Fork Toutle River at Kid Valley, near Mount St Helens, Washington, February 24, 1986, view upstream.

Figure 6. Channel reach in vicinity of gaging stations on streams, near Mount St. Helens, Washington: (photographs by Lyn Topinka).

A, South Fork Toutle River at Camp 12, March 1, 1982, view upstream;

B, Toutle River at Tower Road, April 4, 1983, flow to left

Figure 7. Channel reach in vicinity of gaging stations on streams, near Mount St. Helens, Washington:

A, Cowlitz River at Castle Rock, August 1, 1980, view upstream under bridge where measurements were made, dredging in middle of river;

B, Muddy River above Clear Creek, 1982, view upstream from measuring cross section (photograph by Lyn Topinka).

Figure 8 . Automatic pumping sampler (U.S. PS-69) in gage house, with air compressor at left, near Mount St. Helens, Washington (photograph by Lyn Topinka).

Figure 9 . Suspended-sediment sampler (U.S. D-74) inside protective box at upstream side of bridge over the Cispus River near Randle, near Mount St. Helens, Washington, July 1, 1980.

Figure 10 . Trees, some over 100 feet tall, blown over by force of eruption blast, near Mount St. Helens, Washington.

Figure 11 . Woody debris floating in the Toutle River at Highway 99 during storm flow, near Mount St. Helens, Washington, February 20, 1982.

Figure 29 . Breach in sediment-retention dam N1 on the North Fork Toutle River, near Mount St. Helens, Washington, early March 1982. The north embankment breached during storm flow on February 20, 1982.

Figure 34 . Sediment-retention structure on the North Fork Toutle River, near Mount St. Helens, Washington, February 1988 (photograph by Lyn Topinka).

Photograph of TR2 bedload sediment sampler

Figure 83 . Deposits from lahar of March 19, 1982, at the Toutle River at Highway 99, near Mount St. Helens, Washington.

Background for Outline . Antique postcard of Mount St. Helens by C.P. Johnston Co., Seattle, Washington

Photograph at Summary . Postcard of Mount St. Helens, 1940, by Union Oil Co. of California

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