US Bridges

Slickpoo Road over Mission Cr;m.Wittman Br

Fair

Nez Perce County, Idaho · 3.8 S. 1.6 W. Culdesac · Structure no. 000000000029940

Built
1987
38 years old, rebuilt 2011
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Slickpoo Road over Mission Cr;m.Wittman Br is a steel stringer/multi-beam or girder carrying Slickpoo Road over Mission Cr;m.Wittman Br in Nez Perce County, Idaho. It was built in 1987 and reconstructed in 2011, so it is 38 years old, younger 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 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 26 ft (7.9 m) long and 21 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesSlickpoo Road
CrossesMission Cr;m.Wittman Br
Location3.8 S. 1.6 W. Culdesac
RouteCounty Highway 0
CountyNez Perce County
StateIdaho
Coordinates46.31678, -116.71117
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.9 US tons
Inventory rating74 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 15
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width21 ft (6.4 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Slickpoo Road over Mission Cr;m.Wittman Br built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 2011.

What condition is Slickpoo Road over Mission Cr;m.Wittman Br 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 2024.

How much traffic does Slickpoo Road over Mission Cr;m.Wittman Br carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Slickpoo Road over Mission Cr;m.Wittman Br?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 21 ft wide.

Who owns Slickpoo Road over Mission Cr;m.Wittman Br?

It is owned by the County Highway Agency.