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November 30, 2021: SLIDO 4.4 data update - web map, services, and geodatabase. SLIDO-4.4 supersedes all previous releases of SLIDO.

View SLIDO-4.4 data on interactive map. Note that map data have been clipped to the Oregon boundary.
Get SLIDO-4.4 geodatabase and map services
SLIDO Story Map

Statewide Landslide Information Database for Oregon, release 4 (SLIDO-4.0), by Jon J. Franczyk, William J. Burns, and Nancy C. Calhoun

SLIDO-4.0: text report only (PDF) | Complete publication: report and GIS data (.zip file)

One of the most common and devastating geologic hazards in Oregon is landslides. Average annual repair costs for landslides in Oregon exceed $10 million, and severe winter storm losses can exceed $100 million. As population growth continues and development into landslide susceptible terrain occurs, damage and loss from this natural hazard will continue to grow. DOGAMI created the Statewide Landslide Information Database for Oregon to improve the understanding of landslide hazards in Oregon and to provide a statewide base level of landslide data.

SLIDO-4.0 supersedes all previous releases of SLIDO.

Comparison of SLIDO releases:

	Landslide Polygons	Studies Used	Historical Landslide Point Locations	Susceptibility Data
SLIDO-1	15,093	257	0	no
SLIDO-2	22,154	313	10,636	no
SLIDO-3.0	37,226	347	12,075	no
SLIDO-4.0	47,586	357	13,994	yes
SLIDO-4.1	49,604	358	14,002	yes
SLIDO-4.2	53,311	359	14,326	yes

A landslide susceptibility map shows modeled data that predicts the potential of a region or area to have landslides. SLIDO 4.0 includes three kinds of landslide susceptibility data:

Detailed shallow landslide susceptibility. These data model the potential for landslides that involve movement of a relatively thin layer of slope material and have a shallow failure plane (Figure 9A). These are fine-grained, large-scale maps (1:8,000) and are thus intended for use at a local scale. This dataset is in raster format at a 3-foot (1-meter) resolution.
Detailed deep landslide susceptibility. These data model the potential for landslides that involve movement of a thicker layer of slope material (Figure 9B). These are fine-grained, large-scale maps (1:8,000) and are thus intended for use at a local scale. This dataset is in polygon feature class format.
Statewide landslide susceptibility overview map. This map is a coarse-grained, small-scale (1:500,000) map of the entire state of Oregon and is for use at a regional scale (Figure 9C). This dataset is in raster format at a 32-foot (10-meter) resolution.

DISCLAIMER
This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from
the results shown in the publication.

FUNDING
Funding for SLIDO-4.0 provided in part by FEMA through an interagency agreement with OEM (HMGP DR-4258-OR).

RELATED PUBLICATIONS

DOGAMI Special Paper 42, Protocol for inventory mapping of landslide deposits from light detection and ranging (lidar) imagery
DOGAMI Special Paper 45, Protocol for shallow-landslide susceptibility mapping
DOGAMI Special Paper 48, Protocol for deep landslide susceptibility mapping
Landslide susceptibility overview map of Oregon (DOGAMI Open-File Report O-16-02)