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US20/O.B. Riley – Cook Roundabout Alternative 1

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Page 1: 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

US20/O.B. Riley – Cook Roundabout Alternative 1

Page 2: 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

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

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

US20/O.B. Riley – Cook Roundabout Alternative 2

Page 5: 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

US20/O.B. Riley – Cook Roundabout Alternative 2

Page 6: 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

US20/O.B. Riley – Cook Roundabout Alternative 2

Page 7: 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

US20/O.B. Riley-Cook Half Diamond Single Point Interchange Hybrid

Page 8: 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

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

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