USGS/Cascades Volcano Observatory, Vancouver, Washington
USGS/WRD Monitoring Station
14242580 - Toutle River at Tower Road near Silver Lake, WA
Historical Graphics of Interest
-
[Graphic,13K,GIF]
Flood of February 1996
-- stage in feet above gage ...
(Info)
-
[Graphic,13K,GIF]
Flood of November-December 1995
-- stage in feet above gage ...
(Info)
Station Information
14242580 - TOUTLE RIVER AT TOWER ROAD NEAR SILVER LAKE, WA
Latitude (degrees, minutes, and seconds) ...... 462002
Longitude (degrees, minutes, and seconds) ..... 1225020
State Code .................................... 53
County Code ................................... 015
County Name ................................... Cowlitz
Basin Name .................................... Lower Cowlitz
Hydrologic Unit Code .......................... 17080005
Drainage Area (square miles) .................. 496.00*
Gage Datum (feet, from topo map) .............. 160.00 (WA-97-1) **
Location ...................... NW/SW Sec.20, T.10 N., R.1 W.,
on right bank 10.7 mi downstream from
confluence of North and South Forks Toutle
River, 2.9 mi northwest of Silver Lake, at
mile 6.5. (Water-Data Report WA-94-1)
----Period(s) of Record----
March 1981 to current year
* Approximately 21 sq.mi. is noncontributing.
Prior to July 7, 1981, approximately 40 sq.mi. was noncontributing.
** 1) USGS Surface Water Data Retrieval Program (1998) lists Gage Datum
120.0 feet above NGVD
|
Site History and Remarks
-
Prior to December 7, 1981, at site
500 ft upstream on left bank.
(internal communication)
-
A station on the same river
(
14242500 - Toutle River near Silver Lake, Wa)
was operated 9.2 miles
upstream, from September 1909 to August 1912,
October 1919 to October 1921, May 1922 to
December 1923, and September 1929 to
May 18, 1980, on which date the station was
destroyed by a large debris and mud flow
that came down the North and South Forks of
the Toutle River after an explosive eruption
of Mount St. Helens. (internal communication, 1995)
-
The muddy debris flows that inundated the
North and South Forks of the Toutle River
channel on May 18, 1980, passed through
the main Toutle River. The highway bridge
at Tower Road was destroyed by the North Fork
Toutle River lahar on May 18, 1980, and it
was replaced in 1981. Vertical-profile data
were collected at the upstream side of the
bridge. The bridge is 1,300 feet upstream
from the cableway measuring section for the
Toutle River at Tower Road gaging station.
(Dinehart, 1987)
Reach Description
-
One channel at all stages. The channel makes
a slight bend in the vicinity of the gage and
is straight for about ___ mile upstream and
downstream. Both banks are wooded, fairly
steep, and not subject to overflow.
(internal communication, 1995)
- During storm runoff, the approach section
of the channel was nearly perpendicular
to the bridge; but during low flow, the
approach deviated from perpendicular by as
much as 20 degrees. The cross-section is
deepest between the right bank and the
rightmost pier. Flow converges from the
approach as it passes through this section.
The section to the left of the rightmost
pier is shallower and less affected by
convergent flow. To avoid the convergent
flow, most vertical-profile measurements
were made at a single vertical located
to the left of the rightmost pier. The
right bank of the approach consists of
unprotected lahar deposits and older
consolidated soils. The left bank is
riprapped from a point 300 feet upstream
of the bridge to the bridge wingwalls.
(Dinehart, 1987)
-
The data-collection reach extends from the
gage, which is adjacent to Tower Road bridge,
to a cableway located about 330 meters downstream.
The channel bends to the left at the bridge,
curves gently to the right near the cableway
and is straight for about 500 meters downstream.
Flow is confined to a single channel except
during intermediate discharges (about
75-150 cubic meters/second), when it usually
divides into a main channel, normally on the
left, and a lesser secondary channel. The
unstable streambed typically consists of
sediments ranging in size from sand to cobbles.
Stream banks near the cableway are bordered
by large trees, stumps, and saplings and
generally are stable. Substantial erosion
on the left bank near the bridge has required
the emplacement of riprap, but erosion on the
right bank at the bridge has been limited by
the presence of bedrock.
(Childers, et.al., 1988)
Location Map
-
-- base map courtesy USGS Mapping Information Server
Useful Links
Site Published In (USGS Water Resources Data Reports NOT LISTED)
-- (List not guaranteed complete) --
Childers, Dallas, Hammond, Stephen E., and Johnson, William P., 1988,
Hydrologic Data for Computation of Sediment Discharge,
Toutle and North Fork Toutle Rivers near Mount St. Helens, Washington,
Water Years 1980-84:
U.S. Geological Survey Open-File Report 87-548.
Dinehart, Randy L., 1986,
Sediment Data For Streams Near Mount St. Helens, Washington,
Volume 2, Water Years 1981-83:
U.S. Geological Survey Open-File Report 85-632.
Dinehart, Randy, 1987,
Vertical Profiles of Velocity and Suspended Sediment in Streams
Near Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 87-377.
Dinehart, Randy L., 1992,
Sediment Data For Streams Near Mount St. Helens, Washington,
Volume 3, Water Years 1984-87:
U.S. Geological Survey Open-File Report 91-219.
Meyer, D. F., Nolan, K. M., and Dodge, J. E., 1986,
Post-Eruption Changes in Channel Geometry of Streams in the
Toutle River Drainage Basin, 1980-82, Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 85-412.
Meyer, D. F., and Dodge, J. E., 1988,
Post-Eruption Changes in Channel Geometry of Streams in the
Toutle River Drainage Basin, 1983-85, Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 87-549.
Simon, Andrew, 1999,
Channel and Drainage-Basin Response of the Toutle River System
in the Aftermath of the 1980 Eruption of Mount St. Helens, Washington:
U.S. Geological Survey Open-File Report 96-633
Uhrich, Mark A., 1990,
Precipitation Data for the Mount St. Helens Area, Washington -- 1981-86:
U.S. Geological Survey Open-File Report 90-117.
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11/25/02, Lyn Topinka