US Bridges

Mission Avenue over Spokane River

Fair

Spokane County, Washington · 1.13 E of SR395 · Structure no. 085123000000000

Built
1909
116 years old
Condition
Fair
inspected August 2023
Type
Arch - Deck
Concrete
Length
390 ft
5 main spans
Daily traffic
19,319
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mission Avenue over Spokane River is a concrete arch - deck carrying Mission Avenue over Spokane River in Spokane County, Washington. It was built in 1909, so it is 116 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 5 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 19,319 vehicles a day, roughly 2% of them trucks, projected to reach 26,400 by 2039. The structure is 390 ft (118.9 m) long and 58 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMission Avenue
CrossesSpokane River
Location1.13 E of SR395
RouteCity Street 803
CountySpokane County
StateWashington
Coordinates47.67175, -117.38762
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating106.8 US tons
Inventory rating106.5 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length390 ft (118.9 m)
Longest span76 ft (23.2 m)
Deck width58 ft (17.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,319 (2023)
Projected traffic26,400 by 2039
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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$23.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mission Avenue over Spokane River built?

It was built in 1909, making it 116 years old in 2025.

What condition is Mission Avenue 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 August 2023.

How much traffic does Mission Avenue over Spokane River carry?

About 19,319 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Mission Avenue over Spokane River?

The structure is 390 ft (118.9 m) long with a longest span of 76 ft (23.2 m) and a deck 58 ft wide.

Who owns Mission Avenue over Spokane River?

It is owned by the City or Municipal Highway Agency.