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How
do WA roads compare Nationally?
A comparison of physical maintenance expenditures prepared in 1997 showed that Washington's costs are $7,487 per system mile, while the nationwide average of 50 states' costs is $9,597 per system mile. WSDOT is 22% below the average expenditure per system mile nationwide. This trend indicating Washington to be lower than average cost holds for almost all functional classes.
If the cost of snow removal is added to physical maintenance, the comparison is as follows: WSDOT $10,295 per system mile, All States average $11,149 per system mile. With snow removal included, WSDOT's maintenance expenditures are almost 8 percent lower than the national average. This narrowing of the gap by including the winter costs is not surprising, since the cost-per-system-mile statistic is computed including many states which have much lighter winter burdens. WSDOT is now receiving results from a survey of other state transportation departments to compare costs of constructing a "diamond interchange," on a one mile new alignment of a four lane highway in an urban area. WSDOT's sample project is the SR 14-192nd Avenue interchange in Clark County. We've asked other DOT's to compare their unit costs on a comparable project. So far, we've received responses from 13 states. Costs ranged from $3.8 million to $21.3 million. WSDOT's cost is $5.6 million, the fourth least expensive of respondents so far. A summary of the information collected to date is below: State Cost Ranking on a Typical Interchange -- 14 responses
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