US Bridges

SH 58 over Rock Creek

Fair

Kootenai County, Idaho · 0.3 E. Washington Border · Structure no. 000000000014905

Built
1983
42 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
84 ft
1 main span
Daily traffic
2,500
2023 count
Owner
State
State Highway Agency

About this bridge

SH 58 over Rock Creek is a prestressed concrete box beam or girders - multiple carrying SH 58 over Rock Creek in Kootenai County, Idaho. It was built in 1983, so it is 42 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 84 ft (25.6 m) long and 42 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

Open in Google Maps
CarriesSH 58
CrossesRock Creek
Location0.3 E. Washington Border
RouteState Highway 58
CountyKootenai County
StateIdaho
Coordinates47.4346, -117.03346
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating82 US tons
Inventory rating33 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span84 ft (25.6 m)
Deck width42 ft (12.9 m)
Roadway width37 ft (11.4 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 closed31.7 mi (51 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 Rock Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is SH 58 over 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 May 2023.

How much traffic does SH 58 over Rock Creek carry?

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

How long is SH 58 over Rock Creek?

The structure is 84 ft (25.6 m) long with a longest span of 84 ft (25.6 m) and a deck 42 ft wide.

Who owns SH 58 over Rock Creek?

It is owned by the State Highway Agency.