Landslide assessment of Newell Creek Canyon, Oregon City, Oregon
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:5095488
- Portland State Univ., OR (United States). Dept. of Geology
A study has been conducted in Newell Creek Canyon near Oregon City, Oregon, T3S, T2S, R2E. A landslide inventory has located 53 landslides in the 2.8 km[sup 2] area. The landslides range in area from approximately 15,000m[sup 2] to 10m[sup 2]. Past slides cover an approximate 7% of the canyon area. Landslide processes include: slump, slump-translational, slump-earthflow and earthflow. Hard, impermeable clay-rich layers in the Troutdale Formation form the failure planes for most of the slides. Slopes composed of Troutdale material may seem to be stable, but when cuts and fills are produced, slope failure is common because of the perched water tables and impermeable failure planes. Good examples of cut and fill failures are present on Highway 213 which passes through Newell Creek Canyon. Almost every cut and fill has failed since the road construction began. The latest failure is in the fill located at mile-post 2.1. From data gathered, a slope stability risk map was generated. Stability risk ratings are divided into three groups: high, moderate and low. High risk of slope instability is designated to all landslides mapped in the slide inventory. Moderate risk is designated to slopes in the Troutdale Formation greater than 8[degree]. Low risk is designated to slopes in the Troutdale Formation less than 8[degree].
- OSTI ID:
- 5095488
- Report Number(s):
- CONF-9305259--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540250 -- Environment
Terrestrial-- Site Resource & Use Studies-- (1990-)
58 GEOSCIENCES
580000* -- Geosciences
DEVELOPED COUNTRIES
ENGINEERING GEOLOGY
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGY
GEOMORPHOLOGY
GROUND MOTION
LANDSLIDES
MOTION
NORTH AMERICA
OREGON
RISK ASSESSMENT
SITE CHARACTERIZATION
SLOPE STABILITY
SOIL-STRUCTURE INTERACTIONS
STABILITY
USA
VALLEYS
540250 -- Environment
Terrestrial-- Site Resource & Use Studies-- (1990-)
58 GEOSCIENCES
580000* -- Geosciences
DEVELOPED COUNTRIES
ENGINEERING GEOLOGY
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGY
GEOMORPHOLOGY
GROUND MOTION
LANDSLIDES
MOTION
NORTH AMERICA
OREGON
RISK ASSESSMENT
SITE CHARACTERIZATION
SLOPE STABILITY
SOIL-STRUCTURE INTERACTIONS
STABILITY
USA
VALLEYS