US Bridges

Riverway Road over Little Spokane River

Good

Spokane County, Washington · 1.0 N Chattaroy · Structure no. 083072000000000

Built
1984
41 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
117 ft
1 main span
Daily traffic
109
2020 count
Owner
County
County Highway Agency

About this bridge

Riverway Road over Little Spokane River is a prestressed concrete stringer/multi-beam or girder carrying Riverway Road over Little Spokane River in Spokane County, Washington. It was built in 1984, so it is 41 years old, younger 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 109 vehicles a day, roughly 26% of them trucks, projected to reach 156 by 2042. The structure is 117 ft (35.7 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesRiverway Road
CrossesLittle Spokane River
Location1.0 N Chattaroy
RouteCounty Highway 4175
Coordinates47.90394, -117.34354
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating28.2 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length117 ft (35.7 m)
Longest span116 ft (35.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic109 (2020)
Projected traffic156 by 2042
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Riverway Road over Little Spokane River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Riverway Road over Little 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 August 2023.

How much traffic does Riverway Road over Little Spokane River carry?

About 109 vehicles per day (2020 count), of which roughly 26% are trucks.

How long is Riverway Road over Little Spokane River?

The structure is 117 ft (35.7 m) long with a longest span of 116 ft (35.4 m) and a deck 32 ft wide.

Who owns Riverway Road over Little Spokane River?

It is owned by the County Highway Agency.