Cultural Risk and Uncertainty
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Cultural & Environmental Data Viewer

Cultural Data Use

This map depicts data for modeling Cultural Risk for electricity transmission development in support of WECC's Regional Transmission Expansion Planning program. This map contains three cultural data layers: Cultural Risk, Inventory Areas; and Neighborhood Site Density.
[Click here for layer descriptions]

The data presented in this application is intended for use in preliminary, early stage planning processes only. It is not intended to satisfy requirements under Section 106 of the National Historic Preservation Act or other laws and regulations. For project specific analyses, please consult with the appropriate State Historic Preservation Office regarding existing data and additional survey requirements.
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Siting-level analyses, while they may employ some of the same data sets as planning-level analyses, will also use other project-specific data sets. Because of the scale at which the regional Transmission Expansion Planning process operates, it is not possible or appropriate to consider all project-level data that could be critical during transmission line siting. WECC recommends any potential transmission corridors generated through this mapping application be thoroughly reviewed against siting-level data and any applicable laws and regulations.

Corridor Mapping Help

Drawing a few sample lines is recommended to get acquainted with the Corridor Mapping tools.

[Draw Line]

Click on the map to begin. Each subsequent click will place a new vertex. To complete the line, simply click on the final point after it is placed. Avoid rapid double-clicking, as this may cause errors.
[Undo] will remove the most recent vertex.
[Cancel] will remove the line you are currently drawing.

[Edit Line]

Editing allows you to add and move vertices.
[Save] will commit any changes permanently
[Cancel] will remove vertices added in the editing process, but will not revert the movement of original verteces moved in the editing process

[Delete Line]

After clicking the Delete button, click on any drawn line to remove it from the map.
[Save] will permanently remove all lines selected in the deletion process.
[Cancel] will return all lines selected for deletion

All drawn lines exist only in the current browser session and is not saved.

Route Name:  

Environmental Risk Crossings:

Class 1: Class 3:
Class 2: Class 4:

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  • 230kV Single Circuit
  • 345kV Single Circuit
  • 500kV Single Circuit
  • 500kV HVDC Bi-pole

Estimated Capital Costs

Baseline transmission cost only; no multipliers applied


*Marine and Other not included

Estimated Mitigation Costs

Includes cultural & environmental cost estimates


*Class 4, Marine, and Other not included

Mitigation Cost Breakdown

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230kV Single Circuit
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  • Cultural Risk
  • Cultural Inventory
  • Cultural Density
  • Environmental Risk
  • Transmission Lines
  • Infrastructure
  • Other Environmental Data
  • Land Ownership
  • Crucial Habitat
  • BLM Rent Zones
  • Slope Classes
  • Land Cover

Corridor Mapping

  • Draw Line
  • Edit Line
  • Delete Line