US Bridges

Stc 5803;MOYIE Rvr over Moyie River;sinclair Br.

Fair

Boundary County, Idaho · 1.2 S. Addie · Structure no. 000000000020670

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
195 ft
3 main spans
Daily traffic
120
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 5803;MOYIE Rvr over Moyie River;sinclair Br. is a prestressed concrete tee beam carrying Stc 5803;MOYIE Rvr over Moyie River;sinclair Br. in Boundary County, Idaho. It was built in 1975, so it is 50 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 120 vehicles a day, roughly 33% of them trucks, projected to reach 180 by 2042. The structure is 195 ft (59.4 m) long and 28 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesStc 5803;MOYIE Rvr
CrossesMoyie River;sinclair Br.
Location1.2 S. Addie
RouteCounty Highway 5803
CountyBoundary County
StateIdaho
Coordinates48.93322, -116.17658
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 spans3
Design loadHS 20
Structure length195 ft (59.4 m)
Longest span119 ft (36.3 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 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 closed37.9 mi (61 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;sinclair Br. built?

It was built in 1975, making it 50 years old in 2025.

What condition is Stc 5803;MOYIE Rvr over Moyie River;sinclair 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 2024.

How much traffic does Stc 5803;MOYIE Rvr over Moyie River;sinclair 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;sinclair Br.?

The structure is 195 ft (59.4 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;sinclair Br.?

It is owned by the County Highway Agency.