Wyoming Department of Transportation

Environmental (NEPA) Documents

Harney_Street Viaduct

The Harney Street Viaduct Environmental Assessment was completed and signed by FHWA and WYDOT on September 12, 2012.  The Finding of No Significant Impact (FONSI) was signed on December 31, 2012.
The Environmental Assessment, Appendices, and FONSI can be viewed by using the links below.

Etna North - US 89

The Wyoming Department of Transportation (WYDOT) is planning on improving a section of US 89 and is in the process of preparing an Environmental Assessment. WYDOT held a scoping meeting on March 5, 2013 to solicit input on the project. The following documents were provided at the scoping meeting. 

Additional information can be found at www.etna-north.com

Public Meeting Handouts

Map 1

Map 2

Map 3



Hoback Junction EA

The Wyoming Department of Transportation (WYDOT) proposes improvements to a 0.6-mile section of U.S. Highway 26/89, between milepost (MP) 141.4 and 140.7, including the U.S. 26/89, U.S. 189/191, and U.S. 26/89/189/191 intersection and the Snake River Bridge immediately southwest of the Hoback Junction community.

WYO 59 Relocation Project

The Wyoming Department of Transportation (WYDOT) is initiating a feasibility study to evaluate relocating a segment of Wyoming State Highway 59 (WYO 59) north of Gillette in Campbell County. The project, known as the WYO 59 Relocation Project, would relocate approximately 4.35 miles of WYO 59 near the Eagle Butte Coal Mine.

Alpha Coal West, Inc. (Alpha) owns and operates the Eagle Butte Mine in Campbell County. The mining operations are currently restricted by WYO 59. To continue mining operations, as permitted by the state of Wyoming and the Bureau of Land Management (BLM), Alpha has requested WYDOT evaluate relocating an approximate 4.35 mile segment of WYO 59. WYDOT is initiating scoping, an environmental resource evaluation, and an engineering feasibility study for relocating WYO 59. WYDOT will use this information to make a decision regarding relocating WYO 59 and to determine the best location for the relocated road segment if the road is relocated.

Alpha is financially responsible for the feasibility study, design, and construction costs associated with relocating this segment of WYO 59. WYDOT is responsible for approving the location of the relocated segment and overseeing the design and construction. No federal or state funds will be used to relocate the highway, and no Federal Highway Administration (FHWA) action is needed to approve relocation.

WYDOT held its third Public Meeting on August 20, 2014 in Gillette. Below are the boards and handouts presented at this meeting. 

Welcome Board

Proposed Relocation

Connecting Route





Burgess Junction South - US 14

WYDOT is initiating scoping to study the potential environmental impacts associated with proposed improvements along an approximate 11-mile segment of U.S. Highway 14 (US 14) known as the Burgess Junction South Project. The project includes widening and pavement overlay with isolated locations of US 14 being fully reconstructed.
It is expected that information received will be used to prepare an environmental assessment (EA), in compliance with the National Environmental Policy Act (NEPA).
Newsletter - describes the project and project area. 
Public scoping meeting displays from the June 5, 2013 public meeting at the Tongue Valley Community Center in Dayton. 

Rupe Hill Landslide

The Wyoming Department of Transportation (WYDOT) in coordination with the Federal Highway Administration (FHWA) has evaluated the impacts of realigning a segment of U.S. Highway (US 14) to address landslide concerns near Rupe Hill. The impacts and mitigation measures are described and documented in the environmental assessment (EA) dated June 2013. The EA was approved on June 14, 2013. The 30-day public and agency review period began on June 25, 2013, and ended on August 2, 2013.

The EA and this Finding of No Significant Impact (FONSI) were prepared in compliance with The National Environmental Policy Act (NEPA) and other applicable laws, Executive Orders, and related requirements. As required by NEPA, an environmental analysis was conducted, potential impacts associated with the proposed Project were documented, and mitigation measures were determined. No significant impacts were identified during the course of this environmental analysis.

Environmental Assessment with Appendices

Supporting Reports

Paleontological Report

The Harney Street Viaduct Environmental Assessment was completed and signed by FHWA and WYDOT on September 12, 2012.  The Finding of No Significant Impact (FONSI) was signed on December 31, 2012.
The Environmental Assessment, Appendices, and FONSI can be viewed by using the links below.

WYO 220 - Muddy Gap to Casper EA

WYDOT proposes to reconstruct two adjacent sections of WYO-220: Muddy Gap to Casper, Casper South and Narrows section in Natrona County, Wyoming. The two sections total approximately 12 miles in length.

Lewis Street Bridge

The proposed project would replace the Lewis Street Bridge over the Little Goose Creek in Sheridan, Wyoming. The proposed project would also include improvements to Lewis Street, closing the south end of the Marion Street connection to Lewis Street and closing the Alger Street connection to Lewis Street . A portion of Marion Street would become a parking area. A bike path connecting to the existing bike path system would be constructed. The No-Build alternative and one Build alternative (the Preferred Alternative) were analyzed in detail in the Environmental Assessment (EA). A Section 4(f) evaluation is provided in this document. The 4{f) evaluation determined a no use for any 4(f) historic properties and a net benefit for the 4(f) park located in the project area.

Environmental Assessment

Finding of No Significant Impact

North Sheridan Interchange

The proposed project includes reconstruction and potentially relocation the North Sheridan Interchange, improvements to I-90, and improvements to North Main Street. The North Sheridan Interchange is the first interchange serving the City of Sheridan, Wyoming for eastbound vehicles on I-90 and the last interchange for westbound vehicles on I-90.
Environmental Assessment
Finding of No Significant Impacts


Supporting Documents


Torrington Urban Project

The proposed project would improve US 85, US 26 and US 26-85 in Torrington. Proposed improvements include reconstruction and widening of US 26-85 and US 26, developing a continuous sidewalk system along US 26 and US 26-85, improving the existing storm drainage system on US 26 and US 26-85, and the realignment of US 85 with a grade separated crossing of the BNSF Railway tracks. The No-Build alternative and one Build alternative (the Preferred Alternative) were analyzed in the Environmental Assessment (EA).
The Finding of No Significant Impact (FONSI) was completed on Feb. 4, 2008

Laramie South

The Wyoming Department of Transportation plans to make improvements to a 21-mile section of Highway 287 (US 287) in Albany County from Laramie, Wyoming to the Colorado state line to improve safety and mobility along this section of highway. US 287 is a principal arterial that provides an important connection between Laramie and Fort Collins, Colorado. US 287 is heavily used by Laramie residents, local residents living along the corridor, as well as by regional travelers and recreationists from other parts of the state and Colorado.

Jackson South

The Jackson South Record of Decision (ROD) is completed. The ROD indicates the decision or selected alternative, alternatives considered, clarifications on the final Environmental Impact Statement (EIS), and addresses the comments received on the final EIS.  Appendix A covers public involvement and Appendix B addresses each individual comment received on the final EIS.


Highway 59 South

The proposed improvements span a 28-mile section of WYO 59 from just south of the Town of Wright and State Highway 450 to just north of Bishop Road, about 10 miles south of the City of Gillette, in Campbell County, Wyoming. 

Douglas Streets - Richards Street and 4th Street

The Wyoming Department of Transportation (WYDOT), in coordination with The Federal Highway Administration (FHWA), has down-scaled the scope of the road improvements that were being studied in the City of Douglas Environmental Assessment FHWA-WY-EA-08-03, 4th and Richards streets, Converse County, Wyoming. The project has been down-scaled based on available funding and consists mainly of milling and re-paving the existing within the existing right of way along with modifications at Interstate- 25 (1-25) interchange to improve access to WYDOT's proposed maintenance facility near I -25.
As a result of these changes, WYDOT and FHWA have determined that the project is categorically excluded from further documentation under the National Environmental Policy Act (NEPA). The rationale for this decision is the lack of improvements and resulting impacts outside of the right of way. The environmental impacts associated with the project have been documented and serve as the basis for the NEPA decision that is being made.
Three categorical exclusions were completed for the above project.
Letter to Mayor of Douglas indicating the down-scaled scope of the road improvement

Cody to Powell

This Environmental Assessment addresses improvements to US 14A, between Cody and Powell, Wyoming. The primary need for improvements is to address the growing traffic volumes along US 14A as well as to arrest the growing number of crashes and the crash rate.

Casper West Belt

The project would consist of a new highway between State Highway 220 and US 20/26 west of the City of Casper (Figure 1-2). The southern terminus would be on Highway 220, approximately three miles southwest of Robertson Road. The northern terminus would be at the intersection of US 20/26 (Shoshoni Bypass) and Business 20/26. The two-lane highway would be approximately 7.5 miles in length and would meet current design standards for a typical rural highway.

Grading and Structures Plans (Large file 36MB/250 pages)

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