MSTI Web Mapping Application

Mountain States Transmission Intertie (MSTI)

Under Major Facility Siting Act administrative rules, an applicant is required to submit to DEQ an application describing its proposed alignment and a minimum of two alternatives to construct a 500 kV electric transmission line. The following maps are being provided on an interim basis for members of the public to view detailed line location for NorthWestern Energy's proposed alignment and its two alternative locations. The alignments and siting considerations shown are based on data received from NorthWestern Energy's consultant and ammended by the involved agencies.

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MAP LEGEND

Siting Alternatives

MSTI Alternatives

Townsend to Mill Creek

Alternative A

Alternative 1A

Alternative 1A: Offset for sake of reliability

Alternative 1B: Preferred Route

Alternative 1B: Offset for sake of reliability

Alternative 1C

Mill Creek to Glen

Alternative 2A

Alternative 2B: Preferred Route

Alternative 2C

Glen to State Line

Alternative 3A

Alternative 3B: Preferred Route

State Line to Sheep Station

Alternative 4A: Preferred Route

Sheep Station to Coffee Point

Alternative 5A: Preferred Route

Alternative 5B

Coffee Point to Midpoint

Alternative 6A: Preferred Route

Local Routing Options

Local Routing Options

Preliminary Access Roads

Assumed New Road

Assumed Cross Country Construction & Maintenance Travel

** The construction access mapping is indicative of possible and assumed access considerations. This effort was developed for alternative route comparison to satisfy MFSA Circular 2, Section 3.7 (7), only using existing USDA NAIP aerial photography and USGS DRG topographic quad data. This effort is based on the assumed centerlines shown. All access road information is subject to change pending completion of final engineering design on the selected route for the project. All access routes and roads on private property (temporary or permanent) are a condition of individual landowner negotiation and approval and are shown here for alternative route comparison only.

Siting Considerations

Land Use

School

Residence

Other Structure

FCC Communication Tower

FAA Airport/Airstrip

Apiary

Conservation Reserve Program (CRP) Land

Platted Subdivision

Urban/Developed

Center Pivot Irrigation

Irrigated Cropland

Dry Cropland

Disturbed Land

Land Jurisdiction

Department of Energy

Indian Reservation

USDA Agricultural Research Service

USDA Forest Service

USDA Bureau of Land Management

USDI Bureau of Reclamation

State Lands

Protected Areas

National Park or National Monument

National Wildlife Refuge

Wilderness Study Area

Area of Critical Environmental Concern (ACEC)

Research Natural Area

Special Recreation Managegement Area

National Natural Landmark

Wildlife Management Area

Primative Area

Conservation Easement

State Park or Recreation Area

Private Reserve

Water Resources

100 Year Floodplain

National Wetland Inventory

Interpreted Wetland by NWE Consultant

SSURGO - Hydric Soils

SSURGO - Partially Hydric Soils

Existing Utilities

500kV

345kV

230kV

161kV

138kV

100kV - 115kV

Below 100kV

Unknown Voltage

Energy & Minerals

Federal Active Mining Claim

Federal Mineral Material Disposal Site

Federal Oil or Gas Lease

Federal Superfund Site

Federal Wind Energy Authorization Site

State Permitted Hard Rock Mine

State Permitted Open Cut Mine

Geology

High Liquifaction Potential

Cretaceous Shale

Intrusive Feature

Mass Movement Potential

Horizontal Acceleration Contour
- where 1g = 9.81 m/s² or acceleration caused by gravity
Percent Slope

0% - 8%

8% - 15%

15% - 30%

Greater than 30%

Soil Erodibility (Water/Wind)

No Data/No Data

No Data/Least Susceptible

Least Susceptible/Least Susceptible

Least Susceptible/Moderately Susceptible

Least Susceptible/Most Susceptible

Moderately Susceptible/No Data

Moderately Susceptible/Least Susceptible

Moderately Susceptible/Moderately Susceptible

Moderately Susceptible/Most Susceptible

Most Susceptible/Least Susceptible

Most Susceptible/Moderately Susceptible

Most Susceptible/Most Susceptible

Soil Reclamation Potential

Not Classified

Most Resilient

Somewhat Resilient

Moderately Resilient

Less Resilient

Least Resilient

Habitat

Wildlife Movement Corridor

Anthropogenic (Irrigated, Developed, Disturbed)

Broadleaf/Coniferous Forest

Grassland

Riparian/Wetland/Water

Sage Brush

Shrubland

Sparse Vegetation

Burnt Stand/Cloud Cover

Scenic Quality

Outstanding (A)

Above Average (B)

Common (C)

Sensitive Views

Immediate Foreground (0 to 1,000 feet)

Foreground (1,000 feet to .75 miles)

Middleground (.75 to 3 miles)

Background (3 to 5 miles)

Additional Overlays

Land Sections

Land Section (Label = Township# Range# Section#)

Siting Alternatives

Siting Considerations

Additional Overlays

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Department of Environmental Quality