US Bridges

SH 3 over ST Maries R;st Maries Br

Fair

Benewah County, Idaho · 0.1 S. ST Maries · Structure no. 000000000018885

Built
1977
48 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
240 ft
3 main spans
Daily traffic
7,100
2023 count
Owner
State
State Highway Agency

About this bridge

SH 3 over ST Maries R;st Maries Br is a steel continuous stringer/multi-beam or girder carrying SH 3 over ST Maries R;st Maries Br in Benewah County, Idaho. It was built in 1977, so it is 48 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 5 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 7,100 vehicles a day, roughly 10% of them trucks, projected to reach 10,650 by 2042. The structure is 240 ft (73.2 m) long and 46 ft wide. If it were closed, the detour would be 87 mi (140 km).

Location

Open in Google Maps
CarriesSH 3
CrossesST Maries R;st Maries Br
Location0.1 S. ST Maries
RouteState Highway 3
CountyBenewah County
StateIdaho
Coordinates47.31481, -116.55517
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating79 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length240 ft (73.2 m)
Longest span90 ft (27.4 m)
Deck width46 ft (13.9 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,100 (2023)
Projected traffic10,650 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed87 mi (140 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.6 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 3 over ST Maries R;st Maries Br built?

It was built in 1977, making it 48 years old in 2025.

What condition is SH 3 over ST Maries R;st Maries 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 April 2024.

How much traffic does SH 3 over ST Maries R;st Maries Br carry?

About 7,100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SH 3 over ST Maries R;st Maries Br?

The structure is 240 ft (73.2 m) long with a longest span of 90 ft (27.4 m) and a deck 46 ft wide.

Who owns SH 3 over ST Maries R;st Maries Br?

It is owned by the State Highway Agency.