US Bridges

SH 58 over N. Fk. Rock Creek

Fair

Kootenai County, Idaho · 2.5 E. Washington Border · Structure no. 000000000014907

Built
2008
17 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
273 ft
3 main spans
Daily traffic
2,500
2023 count
Owner
State
State Highway Agency

About this bridge

SH 58 over N. Fk. Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 58 over N. Fk. Rock Creek in Kootenai County, Idaho. It was built in 2008, so it is 17 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 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 2,500 vehicles a day, roughly 10% of them trucks, projected to reach 3,750 by 2042. The structure is 273 ft (83.2 m) long and 41 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesSH 58
CrossesN. Fk. Rock Creek
Location2.5 E. Washington Border
RouteState Highway 58
CountyKootenai County
StateIdaho
Coordinates47.42389, -116.99306
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.1 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length273 ft (83.2 m)
Longest span90 ft (27.4 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2023)
Projected traffic3,750 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SH 58 over N. Fk. Rock Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is SH 58 over N. Fk. 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 October 2024.

How much traffic does SH 58 over N. Fk. Rock Creek carry?

About 2,500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SH 58 over N. Fk. Rock Creek?

The structure is 273 ft (83.2 m) long with a longest span of 90 ft (27.4 m) and a deck 41 ft wide.

Who owns SH 58 over N. Fk. Rock Creek?

It is owned by the State Highway Agency.