BLM REA CYR 2013 Long-term Future (2060) Road Crossings of Chinook Salmon Habitat

Metadata Updated: November 12, 2020

Although future roads are included in the long-term LCM, we conducted separate spatial analyses intersecting the future layers with our fish distributions to identify the projects or watersheds with the potential to impact fish species of conservation concern. Four datasets were used to represent future road construction in the study area: preferred routes to Nome, Umiat, and Ambler; and proposed forestry roads. There are numerous documented spawning reaches for Chinook and chum salmon that would be impacted by future road crossings (28 and 40, respectively). Both road construction and road use would pose risks to productivity for these populations. Roads have many effects on both aquatic habitat and fish movements. Water quality impairments from road crossings include increased sedimentation and delivery of toxic compounds from the road surface. Types of toxic compounds contributed by roads to streams include heavy metals and organic pollutants (e.g. PCBs or hydrocarbons) from vehicles, ozone from vehicle exhaust, and deicing salts. Physical habitat impairments from incorrectly sized culverts are numerous and include stream channelization; scouring or erosion downstream of perched culverts; ponding and sedimentation upstream; decreased transport of water, sediments, and wood downstream; and partial to complete blockage, which may lead to failure during flood events. Culverts blocking fish passage leads to differences between upstream and downstream fish communities and densities. Culverts in Southcentral Alaska have been shown to block both upstream and downstream migrations of juvenile salmon. Finally, roads are also an important pathway transporting invasive species to aquatic habitats.

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Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) October 6, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) October 6, 2016 (publication)
Responsible Party Alaska Center for Conservation Science, University of Alaska Anchorage (Point of Contact)
Contact Email
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Bbox East Long -147.02905411
Bbox North Lat 67.2602672851
Bbox South Lat 64.3980557406
Bbox West Long -162.595561965
Coupled Resource
Frequency Of Update notPlanned
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Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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