US Bridges

Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br)

Fair

Boundary County, Idaho · 8.8 S. Addie · Structure no. 000000000020661

Built
1991
34 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
196 ft
3 main spans
Daily traffic
120
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br) is a prestressed concrete tee beam carrying Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br) in Boundary County, Idaho. It was built in 1991, so it is 34 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 120 vehicles a day, roughly 33% of them trucks, projected to reach 180 by 2042. The structure is 196 ft (59.7 m) long and 28 ft wide. If it were closed, the detour would be 46 mi (74 km).

Location

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CarriesStc 5803;MOYIE Rvr
CrossesMoyie River(mcdougal Br)
Location8.8 S. Addie
RouteCounty Highway 5803
CountyBoundary County
StateIdaho
Coordinates48.83903, -116.16775
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating70 US tons
Inventory rating32 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length196 ft (59.7 m)
Longest span119 ft (36.3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2023)
Projected traffic180 by 2042
Trucks33%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed46 mi (74 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br) built?

It was built in 1991, making it 34 years old in 2025.

What condition is Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br) 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 Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br) carry?

About 120 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br)?

The structure is 196 ft (59.7 m) long with a longest span of 119 ft (36.3 m) and a deck 28 ft wide.

Who owns Stc 5803;MOYIE Rvr over Moyie River(mcdougal Br)?

It is owned by the County Highway Agency.