US Bridges

Sullivan Road (nb) over Spokane River

Fair

Spokane County, Washington · 0.25 N I-90 · Structure no. 081398000000000

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
437 ft
4 main spans
Daily traffic
28,100
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sullivan Road (nb) over Spokane River is a prestressed concrete continuous stringer/multi-beam or girder carrying Sullivan Road (nb) over Spokane River in Spokane County, Washington. It was built in 1973, so it is 52 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 28,100 vehicles a day, roughly 17% of them trucks, projected to reach 34,300 by 2042. The structure is 437 ft (133.2 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesSullivan Road (nb)
CrossesSpokane River
Location0.25 N I-90
RouteCity Street 4597
CountySpokane County
StateWashington
Coordinates47.6725, -117.19647
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length437 ft (133.2 m)
Longest span114 ft (34.7 m)
Deck width36 ft (11.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,100 (2022)
Projected traffic34,300 by 2042
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$16.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sullivan Road (nb) over Spokane River built?

It was built in 1973, making it 52 years old in 2025.

What condition is Sullivan Road (nb) over Spokane River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does Sullivan Road (nb) over Spokane River carry?

About 28,100 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is Sullivan Road (nb) over Spokane River?

The structure is 437 ft (133.2 m) long with a longest span of 114 ft (34.7 m) and a deck 36 ft wide.

Who owns Sullivan Road (nb) over Spokane River?

It is owned by the City or Municipal Highway Agency.