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SR 904 - Cheney to Four Lakes Project - Route Development Plan - Chapter 7

Alternatives

During the RDP process, conceptual alternatives proposing improvements on SR 904 were developed. WSDOT further refined the analyses down to two feasible alternatives. The design alternatives were evaluated in relation to general environmental, right of way, and infrastructure impacts. Mobility, safety, public sentiment, and economic issues were also considered. The construction cost (Year 2003 dollars) of the two alternatives were comparably close. The right-of-way costs are significantly different. The following provides a synopsis of the alternatives:

Alternative 1 ($14.1 Million)

Five lane undivided with two way left turn lane throughout length of corridor.

Attributes

Improves safety

Improves capacity

Some separation of traffic

Mainline can be constructed within existing right-of-way

Minimal need of right-of-way for county road intersections

Fewer anticipated impacts to environment

Route Continuity

Potential Concerns

No physical separation of traffic

Wider roadway for traffic to cross

Alternative 2 ($18.8 Million)

Four lane divided roadway section with a 60 foot wide rural median

Attributes

Improves safety

Improves capacity

Physical separation of traffic

Potential Concerns

Access Control

o Driveways will be right in/ right out only

o Or Frontage road will be needed

More anticipated impacts to environment

Route Continuity

Additional right-of-way required for the entire length of the corridor

Approximately 6 residential relocations will be required. Exact number will be dependent on design.

The Recommended Alternative for Long Term Solution

The chosen alternative is the five lane with the two way left turn lane throughout the length of the corridor. A traffic signal may be proposed at intersections if warrants are met during the design phase and if a signal is deemed the appropriate solution. There will be partial access control along this route. This alternative is more cost beneficial overall with more advantages and provides the necessary capacity and safety improvements.