Landslide Reconnaissance Following the December 3, 2007 Storm - Mason County
Click Here for Survey
Home > Science & Environment > Topics > Geologic Hazards & Mapping > Landslide Reconnaissance Following the December 3, 2007 Storm - Mason County
Landslide Reconnaissance Following the December 3, 2007 Storm - Mason County 
 

Hoodsport Area Landslides

On December 3rd, a small landslide north of Hoodsport flowed over Highway 101, closing it. Two smaller landslides to the north partially blocked one lane of Highway 101, but a flight on December 10th located a new slide at the site of the other two slides. The new slide was significantly larger and blocked both lanes of Highway 101.

Location of events

Map 1: Location map of the landslides in the Hoodsport area. Click on map to view larger image.

North of Hoodsport Landslide
These two small landslides were typical landslides for this event, having thin soils over bedrock. The landslides blocked the road drainage, causing water to pond onto Highway 101. Between December 6th and December 10th, another landslide failed at or very near the location of the two smaller landslides. That landslide moved across Highway 101, completely blocking both lanes.

Figure 1: Looking north across the two small landslides. Click on photo to view larger image. (photo by Isabelle Sarikhan)

Figure 2: A closer look at the northern landslide; note that the landslide was very shallow, less than a foot thick in most places. Click on photo to view larger image. (photo by Isabelle Sarikhan)

Figure 3: Aerial photo of the landslide that failed between December 6th and December 10th. The landslide possibly occurred on December 10th prior to our flight, as traffic was backing up on the southbound lanes of the highway. Click on photo to view larger image. (photo by Kelsay Davis)

Hoodsport Landslide
This landslide was the most southern landslide along Highway 101 that we investigated. The landslide was relatively shallow and moved still-standing trees, along with their root balls, onto Highway 101. The landslide flowed across both lanes of Highway 101, but did not damage the house to the east.

Figure 4: Looking north on Highway 101 at the scarp of the landslide; note that the landslide is fairly shallow and moved as one unit onto the highway. Click on photo to view larger image. (photo by Isabelle Sarikhan)

Figure 5: Looking north on Highway 101; the landslide's failure plane was on bedrock, allowing it to flow beneath the roots of the trees. Click on photo to view larger image. (photo by Isabelle Sarikhan)

 ‭(Hidden)‬ Files Filter

to specify items for consumption by a Data View. To change the list that this refers to, check the Miscellaneous group in the sidebar tool for the ListURL value and change the URL to point to a different list.

 ‭(Hidden)‬ Contacts Filter

to specify items for consumption by a Data View. To change the list that this refers to, check the Miscellaneous group in the sidebar tool for the ListURL value and change the URL to point to a different list.

 Contacts

Stephen Slaughter
Geology & Earth Resources Division, Hazards Geologist
Washington State Department of Natural Resources
360-902-1498
Fax 360-902-1785
stephen.slaughter@dnr.wa.gov

 Files

system_empty.txt  EMPTY FILE  (0KB  TXT)

 Related Links