US Bridges

Truax Road over South Fork Rock Creek

Fair

Spokane County, Washington · 0.1 W Davis Road · Structure no. 083687000000000

Built
1963
62 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
44 ft
1 main span
Daily traffic
435
2020 count
Owner
County
County Highway Agency

About this bridge

Truax Road over South Fork Rock Creek is a concrete slab carrying Truax Road over South Fork Rock Creek in Spokane County, Washington. It was built in 1963, so it is 62 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 435 vehicles a day, roughly 34% of them trucks, projected to reach 626 by 2042. The structure is 44 ft (13.4 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesTruax Road
CrossesSouth Fork Rock Creek
Location0.1 W Davis Road
RouteCounty Highway 4842
CountySpokane County
StateWashington
Coordinates47.36876, -117.10731
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 rating48.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width33 ft (10 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic435 (2020)
Projected traffic626 by 2042
Trucks34%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Truax Road over South Fork Rock Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Truax Road over South Fork Rock Creek 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 July 2023.

How much traffic does Truax Road over South Fork Rock Creek carry?

About 435 vehicles per day (2020 count), of which roughly 34% are trucks.

How long is Truax Road over South Fork Rock Creek?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 33 ft wide.

Who owns Truax Road over South Fork Rock Creek?

It is owned by the County Highway Agency.