US Bridges

Post Street over Spokane River

Good

Spokane County, Washington · 0.6 N of I-90 · Structure no. 085287000000000

Built
1917
108 years old, rebuilt 2024
Condition
Good
inspected June 2024
Type
Arch - Deck
Concrete
Length
328 ft
1 main span
Daily traffic
2,423
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Post Street over Spokane River is a concrete arch - deck carrying Post Street over Spokane River in Spokane County, Washington. It was built in 1917 and reconstructed in 2024, so it is 108 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,423 vehicles a day, roughly 7% of them trucks, projected to reach 5,272 by 2039. The structure is 328 ft (100 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesPost Street
CrossesSpokane River
Location0.6 N of I-90
RouteCity Street 814
Coordinates47.66214, -117.42421
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.8 US tons
Inventory rating40 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, precast panels
Main spans1 (+2 approach)
Design loadHL 93
Structure length328 ft (100 m)
Longest span260 ft (79.2 m)
Deck width50 ft (15.2 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,423 (2018)
Projected traffic5,272 by 2039
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$8.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Post Street over Spokane River built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 2024.

What condition is Post Street over Spokane River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does Post Street over Spokane River carry?

About 2,423 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is Post Street over Spokane River?

The structure is 328 ft (100 m) long with a longest span of 260 ft (79.2 m) and a deck 50 ft wide.

Who owns Post Street over Spokane River?

It is owned by the City or Municipal Highway Agency.