Fish Passage Effectiveness of Recently Constructed Road Crossing Culverts in the Puget Sound Region of Washington State

The Oso landslide, one of the most recent disasters, occurred on March 22nd, 2014 in western Washington State. It caused significant property damage and killed over 40 people. As a result, a renewed interest has emerged for creating more accurate landslide susceptibility maps for this region. Research addressing landslide susceptibility within the north Puget Sound region of western Washington is lacking; therefore, this study develops a probabilistic GIS-based landslide susceptibility model for the north Puget Sound region. Multivariate logistic regression was utilized to create a landslide susceptibility map of Whatcom, Skagit, Snohomish, and King Counties. To predict probable areas of landslide occurrence, a landslide inventory map was prepared and fourteen topographic, geologic, environmental, and climatic predictor variables were considered. This research aims to assist in restructuring western Washington's landslide policies, and could serve as the first step in producing more accurate landslide susceptibility maps for the region.

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Barriers to upstream passage by two migratory sculpins, prickly sculpin (Cottus asper) and coastrange sculpin (Cottus aleuticus), in northern Puget Sound lowland streams

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2014-0029 ◽

2014 ◽

Vol 71 (11) ◽

pp. 1758-1765 ◽

Cited By ~ 11

Author(s):

Michael Thomas LeMoine ◽

Leo Richard Bodensteiner

Keyword(s):

Pacific Salmon ◽

Stream Water ◽

Puget Sound ◽

Fish Passage ◽

Washington State ◽

Trophic Dynamics ◽

Longitudinal Distribution ◽

Physical Habitat ◽

Upstream Migration ◽

Lowland Streams

We identified and characterized barriers to the upstream distribution by prickly sculpin (Cottus asper) and coastrange sculpin (Cottus aleuticus), based on their longitudinal distribution in 11 streams in the Puget Sound lowlands of Washington State. Eight streams had upstream limits associated with particular instream structures, and these were compared to distinguish features of barriers and non-barriers. In seven streams perch height greater than 15 cm resulted in a complete barrier. In one stream water velocity >4 m·s−1 created a partial barrier. Five of the eight barriers were one- or two-step fish ladders installed to facilitate upstream passage of Pacific salmon and trout. Water quality, physical habitat, and the presence of other fishes were not related to the presence or absence of sculpin species. Fish passage criteria in western North American streams are based on the swimming abilities of Pacific salmon and trout, without consideration for other, less motile native fishes. Structures installed to surmount previously identified impediments to upstream migration continue to inhibit sculpin movement, resulting in loss of upstream habitats for adults, with potential consequences to population size and trophic dynamics.

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Analysis of Trucker and Motorist Opinions toward Truck-Lane Restrictions

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198196156000111 ◽

1996 ◽

Vol 1560 (1) ◽

pp. 73-82 ◽

Cited By ~ 1

Author(s):

Jodi Koehne ◽

Fred Mannering ◽

Mark Hallenbeck

Keyword(s):

Logit Model ◽

Puget Sound ◽

The United States ◽

Washington State ◽

Logit Models ◽

Traffic Operations ◽

Related Factors ◽

Policy Analysts ◽

Benefits And Costs ◽

Puget Sound Region

Truck restrictions, which are becoming increasingly popular throughout the United States, are justified on the grounds of improving traffic operations and safety, decreasing pavement wear, and other related factors. Although an abundance of research has been aimed at quantifying the benefits and costs of truck restrictions, little has been done to measure truckers' and motorists' opinions of such restrictions statistically. Truckers' and motorists' opinions of the truck-lane restrictions in force in the Puget Sound region of Washington State are assessed statistically here. The assessment was made by administering separate opinion surveys to truckers and motorists and estimating logit models that give the probability of an individual's being in favor of or opposed to truck-lane restrictions. In addition, a logit model giving the probability that an individual is even aware of the truck-lane restrictions in the Puget Sound region is estimated. The results of these model estimations give a profile of individuals that are most likely to favor or oppose truck-lane restrictions. These profiles provide valuable information for policy analysts and administrators concerned with implementation since they define the opinions of population groups that can make or break truck restriction policies on U.S. highways.

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