US Bridges

Poplar Road over W.Fk.St Maries River

Fair

Shoshone County, Idaho · At Clarkia · Structure no. 000000000030690

Built
1957
68 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
340
2023 count
Owner
Local
Other Local Agency

About this bridge

Poplar Road over W.Fk.St Maries River is a prestressed concrete tee beam carrying Poplar Road over W.Fk.St Maries River in Shoshone County, Idaho. It was built in 1957, so it is 68 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.

It carries about 340 vehicles a day, projected to reach 510 by 2042. The structure is 60 ft (18.3 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesPoplar Road
CrossesW.Fk.St Maries River
LocationAt Clarkia
RouteCounty Highway 0
CountyShoshone County
StateIdaho
Coordinates47.01167, -116.25664
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 protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 48 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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length60 ft (18.3 m)
Longest span59 ft (18 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2023)
Projected traffic510 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$582,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Poplar Road over W.Fk.St Maries River built?

It was built in 1957, making it 68 years old in 2025.

What condition is Poplar Road over W.Fk.St Maries River 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 August 2023.

How much traffic does Poplar Road over W.Fk.St Maries River carry?

About 340 vehicles per day (2023 count).

How long is Poplar Road over W.Fk.St Maries River?

The structure is 60 ft (18.3 m) long with a longest span of 59 ft (18 m) and a deck 28 ft wide.

Who owns Poplar Road over W.Fk.St Maries River?

It is owned by the Other Local Agency.