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

Access & Use Information

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.

Downloads & Resources


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
Access Constraints Use Constraints: These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived, and both scale and accuracy may vary across the data set. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office for which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This information may be updated without notification., Access Constraints: None, these data are considered public domain
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
Licence The BLM assumes no responsibility for errors or omissions. No warranty is made by the BLM as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data; nor shall the act of distribution to contractors, partners, or beyond, constitute any such warranty for individual or aggregate data use with other data. Although these data have been processed successfully on computers of BLM, no warranty, expressed or implied, is made by BLM regarding the use of these data on any other system, or for general or scientific purposes, nor does the fact of distribution constitute or imply any such warranty. In no event shall the BLM have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the use or reliance on the geographic data or arising out of the delivery, installation, operation, or support by BLM.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

Didn't find what you're looking for? Suggest a dataset here.