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Mountain States Transmission Intertie (MSTI) Alternatives
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 1A
Alternative 1B: Applicant Preferred Route
Alternative 1C
Mill Creek to Glen
Alternative 2A
Alternative 2B: Applicant Preferred Route
Alternative 2C\2E
Alternative 2D
Glen to State Line
Alternative 3A
Alternative 3B: Applicant Preferred Route
Alternative 3C
State Line to Sheep Station
Alternative 4A: Applicant Preferred Route
Sheep Station to Coffee Point
Alternative 5A: Applicant Preferred Route
Alternative 5B
Alternative 5C
Alternative 5D
Coffee Point to Midpoint
Alternative 6A: Applicant Preferred Route
Local Routing Options
Local Routing Options
** Zoom in to view the local routing options.
Variations in Widths
Variations in widths as noted in EIS
** Please view the Map Notes for more information about noted variations in widths and how they may influence alternative routes.
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
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
TIP: Zoom in to use overlay if greyed out
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