US Bridges

Colbert Road over Little Deep Creek

Good

Spokane County, Washington · .1 E of Colbert · Structure no. 083065000000000

Built
1984
41 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
911
2020 count
Owner
County
County Highway Agency

About this bridge

Colbert Road over Little Deep Creek is a concrete slab carrying Colbert Road over Little Deep Creek 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 911 vehicles a day, roughly 11% of them trucks, projected to reach 1,311 by 2042. The structure is 26 ft (7.9 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesColbert Road
CrossesLittle Deep Creek
Location.1 E of Colbert
RouteCounty Highway 606
Coordinates47.82665, -117.34485
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic911 (2020)
Projected traffic1,311 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$395,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Colbert Road over Little Deep Creek built?

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

What condition is Colbert Road over Little Deep Creek 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 September 2023.

How much traffic does Colbert Road over Little Deep Creek carry?

About 911 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Colbert Road over Little Deep Creek?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.

Who owns Colbert Road over Little Deep Creek?

It is owned by the County Highway Agency.