US Bridges

Emerald Creek RD over ST Maries River

Fair

Shoshone County, Idaho · 3.9 N. 3.3 W. Clarkia · Structure no. 000000000030710

Built
1978
47 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
61 ft
1 main span
Daily traffic
190
2023 count
Owner
Local
Other Local Agency

About this bridge

Emerald Creek RD over ST Maries River is a prestressed concrete tee beam carrying Emerald Creek RD over ST Maries River in Shoshone County, Idaho. It was built in 1978, so it is 47 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 190 vehicles a day, roughly 6% of them trucks, projected to reach 285 by 2042. The structure is 61 ft (18.6 m) long and 28 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesEmerald Creek RD
CrossesST Maries River
Location3.9 N. 3.3 W. Clarkia
RouteCounty Highway 0
StateIdaho
Coordinates47.06844, -116.32486
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length61 ft (18.6 m)
Longest span60 ft (18.3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2023)
Projected traffic285 by 2042
Trucks6%
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 Emerald Creek RD over ST Maries River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Emerald Creek RD over 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 2024.

How much traffic does Emerald Creek RD over ST Maries River carry?

About 190 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Emerald Creek RD over ST Maries River?

The structure is 61 ft (18.6 m) long with a longest span of 60 ft (18.3 m) and a deck 28 ft wide.

Who owns Emerald Creek RD over ST Maries River?

It is owned by the Other Local Agency.