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Vantage to Pomona Heights Chapter 4 230 kV Transmission Line Project FEIS Environmental Consequences PAGE 4-181 On the east side of the Columbia River, existing roads would require minimal improvements. The route segment would cross SR-243, requiring consultation and coordination with WSDOT. A Utility Permit would be required from WSDOT. The transmission structures would not be placed within either the highway ROW corridor or WSDOT’s Control Zone. Authorization to span the Columbia River for Route Segment NNR-8 would be required from USACE through the Section 10 Rivers and Harbors Act permitting process. In addition, DNR’s aquatic use authorization for the crossing of state-owned aquatic land would be required. Resulting impacts on the transportation network in this area would be low. Flashing lights or spherical balls on the conductors may be required for the portion of the route segment crossing the Columbia River. Pacific Power would consult with the FAA regarding the installation of lights or any other visual warning devices required for aviation safety. Resulting impacts would be low. Route Segment NNR-8 would require the construction of approximately 0.9 mile of new access road and 0.2 mile of improved access road for a total of approximately 1.1 miles of new road. 4.7.4.18 Route Segment MR-1 Access to route segment MR-1 would be from minor two-track roads crossing rangeland on private and DNR state trust land west of I-82 and from Silk Road, Boland Road, Vanderbilt Road, and two-track roads within the JBLM YTC (Figure 4.7-4). This route segment does not generally follow existing roads for a substantial portion of the route segment and new road construction would be necessary (Access Levels 4 through 7). Route Segment MR-1 would require the construction of approximately 2.0 miles of spur road and 16.7 miles of new access road for a total of approximately 18.7 miles of new road. This route segment would cross I-82 at MP 5.1-5.2. This crossing would involve the placement of a structure on private land on the west side of I-82 directly south of the WSDOT’s westbound Manastash Ridge Viewpoint. The other structure would be placed on the eastern side of the interstate on the JBLM YTC. The crossing length would be approximately 1,270 feet. Conductor to ground clearance of this interstate crossing would be a minimum of 34 feet according to WSDOT. No structures would be placed within the interstate ROW corridor. Temporary road closure of I-82 during conductor stringing activities would occur to maintain safety. A Utility Permit would be required from WSDOT. Impacts on I-82 traffic are discussed in Section 4.7.3 (Impacts Common to All Alternatives) and would be low. Table 4.7-2 New Road Construction Summary by Route Summary ROUTE SEGMENT MILES OF NEW SPUR ROAD MILES OF NEW ACCESS ROAD TOTAL MILES OF NEW ROAD 1a/NNR-1 2.4 miles 0.95 0.00 0.95 1b 12.5 miles 4.52 1.32 5.84 1c 12.9 miles 3.88 4.43 8.31 2a 1.0 mile 0.2 0.64 0.84 2b 16.4 miles 1.88 15.23 17.11 2c 18.1 miles 5.04 6.23 11.27 2d 7.0 miles 1.48 4.67 6.15 3a 0.1 mile 0.08 0 0.08 3b 21.7 miles 8.52 0 8.52 3c 25.4 miles 8.64 3.28 11.92