BLM REA CYR 2013 Culverts by ADFG Rating for Fish Passage Adequacy

Metadata Updated: November 12, 2020

Culverts that are sized or installed inappropriately can have several detrimental impacts to stream physical and chemical habitat, in addition to preventing fish passage. 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 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 event. Finally, roads are also an important pathway transporting invasive species to aquatic habitats. ADFG inventoried 374 culverts within the study area for juvenile fish passage. Culvert conditions that prevent passage to fish include perched outlets, steep gradients, or constricted culverts. These same failures lead to physical habitat impacts both upstream and downstream. Roads assessed included the Dalton, Elliott, Steese, Alaska, Richardson, and Taylor highways, in addition to Chena Hot Springs Road and multiple secondary roads in Fairbanks. Culverts were rated red when conditions were inadequate for fish passage, gray when conditions were unlikely to allow for fish passage, green when conditions allowed for fish passage, and black when more information was needed. Approximately 60% (n = 224) of inventoried culverts were rated red or gray in the Central Yukon study area. This dataset contains a snapshot of the ADFG dataset at the time the REA was compiled. For the most current data, please see the source website at http://www.adfg.alaska.gov/index.cfm?adfg=fishpassage.database

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) August 10, 2015 (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) August 10, 2015 (publication)
Responsible Party Alaska Department of Fish and Game (Point of Contact)
Contact Email
Guid
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Bbox East Long -141.056741102
Bbox North Lat 68.687499807
Bbox South Lat 62.6593091393
Bbox West Long -150.809265682
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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