US Bridges

Mission Creek Road over Mission Creek

FairPosted for load

Nez Perce County, Idaho · 3.1 S. Jacques Spur · Structure no. 000000000020255

Built
1947
78 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
43 ft
1 main span
Daily traffic
180
2023 count
Owner
County
County Highway Agency

About this bridge

Mission Creek Road over Mission Creek is a concrete tee beam carrying Mission Creek Road over Mission Creek in Nez Perce County, Idaho. It was built in 1947, so it is 78 years old, older than the Idaho average of 45.3 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. Its operating status is: posted for load restriction.

It carries about 180 vehicles a day, roughly 13% of them trucks, projected to reach 270 by 2042. The structure is 43 ft (13.1 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesMission Creek Road
CrossesMission Creek
Location3.1 S. Jacques Spur
RouteCounty Highway 0
CountyNez Perce County
StateIdaho
Coordinates46.32886, -116.71478
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating25 US tons
Inventory rating15 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length43 ft (13.1 m)
Longest span41 ft (12.5 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2023)
Projected traffic270 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$450,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mission Creek Road over Mission Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is Mission Creek Road over Mission 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 September 2023.

How much traffic does Mission Creek Road over Mission Creek carry?

About 180 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Mission Creek Road over Mission Creek?

The structure is 43 ft (13.1 m) long with a longest span of 41 ft (12.5 m) and a deck 28 ft wide.

Who owns Mission Creek Road over Mission Creek?

It is owned by the County Highway Agency.