us20/o.b. riley – cook roundabout alternative 1 documents/tumalo concepts map.pdfriley-cook for...
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US20/O.B. Riley – Cook Roundabout Alternative 1
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US20/O.B. Riley – Cook Roundabout Alternative 1
![Page 3: US20/O.B. Riley – Cook Roundabout Alternative 1 Documents/Tumalo Concepts Map.pdfRiley-Cook for lowering roadways Possible ROW needed for conversions at US20/8th 8th St. ROW needs/retaining](https://reader033.vdocuments.us/reader033/viewer/2022042018/5e760c966d2c5a77575fdbe5/html5/thumbnails/3.jpg)
US20/O.B. Riley – Cook Roundabout Alternative 1
![Page 4: US20/O.B. Riley – Cook Roundabout Alternative 1 Documents/Tumalo Concepts Map.pdfRiley-Cook for lowering roadways Possible ROW needed for conversions at US20/8th 8th St. ROW needs/retaining](https://reader033.vdocuments.us/reader033/viewer/2022042018/5e760c966d2c5a77575fdbe5/html5/thumbnails/4.jpg)
US20/O.B. Riley – Cook Roundabout Alternative 2
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US20/O.B. Riley – Cook Roundabout Alternative 2
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US20/O.B. Riley – Cook Roundabout Alternative 2
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US20/O.B. Riley-Cook Half Diamond Single Point Interchange Hybrid
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US20/O.B. Riley-Cook Half Diamond Single Point Interchange Hybrid
![Page 9: US20/O.B. Riley – Cook Roundabout Alternative 1 Documents/Tumalo Concepts Map.pdfRiley-Cook for lowering roadways Possible ROW needed for conversions at US20/8th 8th St. ROW needs/retaining](https://reader033.vdocuments.us/reader033/viewer/2022042018/5e760c966d2c5a77575fdbe5/html5/thumbnails/9.jpg)
Preliminary ConstructionCost Estimates
Alternative Construction Cost Only
Right-of-Way Costs
Total Costs
Roundabout $9,600,000 $1,000,000 $10,600,000
Ped/Bike Undercrossing $2,600,000 TBD TBD
SPI Hybrid (Raise US20 & Partially lower O.B. Riley-
Cook$22,800,000 $6,000,000 $28,800,000