Monitoring Animal Use of Modified Drainage Culverts on the Lolo South Project
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page



Up-to-date Information

Up-to-Date Info: To find the latest DOT information on this topic go to:

Monitoring Animal Use of Modified Drainage Culverts on the Lolo South Project

Filetype[PDF-7.87 MB]

Select the Download button to view the document
This document is over 5mb in size and cannot be previewed
  • English

  • Details:

    • Publication/ Report Number:
    • Resource Type:
    • TRIS Online Accession Number:
    • Edition:
      Final Report January 2001-September 2001
    • Abstract:
      A highway reconstruction project is currently underway in west-central Montana expanding Hwy 93 from 2 lanes to 4 over a distance of approximately 45 miles. Portions of this highway bisect wetlands, which support a variety and abundance of wildlife. As one wildlife mitigation approach, 3 drainage culverts were modified to encourage movement between fragmented wetlands. Metal shelves were installed to allow animal movement during periods of high water. The current project evaluated the effectiveness of these shelves. Six culverts were studied, 3 with shelves (experimentals) and 3 without (controls), from January to September, 2001. Passive infrared TrailMaster cameras were mounted on the roof of each culvert 15 m from one entrance. Cameras were positioned so that mammals traversing culverts either on the floor or on shelves would be photographed. Cameras were checked weekly and film was replaced as needed. Each month small mammal populations adjacent to each culvert were censussed using Sherman live traps. Habitat characteristics adjacent to each entrance were described. This experimental design provided data on which mammal species were present and which were using culverts to move between wetland sites. Seasonal use and use of shelves during high water were assessed. Trapping identified 7 mammal species adjacent to culverts; of these, photographs demonstrated culvert use by deer mice, skunks, short-tailed weasels, muskrats, raccoons, and domestic cats. During wet periods smaller species (e.g., deer mice, short-tailed weasels) used the shelves. Tentative conclusions suggest that several species readily use shelves when water would otherwise prevent movement. However, movement occurs along the solid frame supporting the self rather than over the floor surface. Meadow voles, though abundant close to culverts, fail to use them, suggesting a barrier effect. Species presence is clearly affected by vegetative characteristics at these sites.
    • Content Notes:
      For up to date information, see the US State DOT Wildlife Crossing Structures website at:
    • Format:
    • Funding:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at

    Version 3.21