US Bridges

Loffs Bay Road over Mica Creek

Fair

Kootenai County, Idaho · 5.0 W. 6.0 S. Cda · Structure no. 000000000030491

Built
2006
19 years old, rebuilt 2022
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
250
2023 count
Owner
Local
Other Local Agency

About this bridge

Loffs Bay Road over Mica Creek is a steel stringer/multi-beam or girder carrying Loffs Bay Road over Mica Creek in Kootenai County, Idaho. It was built in 2006 and reconstructed in 2022, so it is 19 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 250 vehicles a day, roughly 5% of them trucks, projected to reach 375 by 2039. The structure is 35 ft (10.8 m) long and 25 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesLoffs Bay Road
CrossesMica Creek
Location5.0 W. 6.0 S. Cda
StateIdaho
Coordinates47.59969, -116.86568
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating46 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length35 ft (10.8 m)
Longest span34 ft (10.5 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic375 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local 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 Loffs Bay Road over Mica Creek built?

It was built in 2006, making it 19 years old in 2025. It was reconstructed in 2022.

What condition is Loffs Bay Road over Mica 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 July 2023.

How much traffic does Loffs Bay Road over Mica Creek carry?

About 250 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Loffs Bay Road over Mica Creek?

The structure is 35 ft (10.8 m) long with a longest span of 34 ft (10.5 m) and a deck 25 ft wide.

Who owns Loffs Bay Road over Mica Creek?

It is owned by the Other Local Agency.