US Bridges

Sma 3824;BNKS Lwmn over Deadwood River

Good

Boise County, Idaho · 22.1 E. Crouch · Structure no. 000000000019920

Built
1985
40 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
184 ft
3 main spans
Daily traffic
690
2023 count
Owner
County
County Highway Agency

About this bridge

Sma 3824;BNKS Lwmn over Deadwood River is a prestressed concrete continuous stringer/multi-beam or girder carrying Sma 3824;BNKS Lwmn over Deadwood River in Boise County, Idaho. It was built in 1985, so it is 40 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 690 vehicles a day, roughly 13% of them trucks, projected to reach 1,035 by 2042. The structure is 184 ft (56.1 m) long and 34 ft wide. If it were closed, the detour would be 42.9 mi (69 km).

CarriesSma 3824;BNKS Lwmn
CrossesDeadwood River
Location22.1 E. Crouch
RouteCounty Highway 3824
StateIdaho
Coordinates44.079, -115.65864
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69 US tons
Inventory rating25 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length184 ft (56.1 m)
Longest span68 ft (20.7 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2023)
Projected traffic1,035 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 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 Sma 3824;BNKS Lwmn over Deadwood River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Sma 3824;BNKS Lwmn over Deadwood River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Sma 3824;BNKS Lwmn over Deadwood River carry?

About 690 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Sma 3824;BNKS Lwmn over Deadwood River?

The structure is 184 ft (56.1 m) long with a longest span of 68 ft (20.7 m) and a deck 34 ft wide.

Who owns Sma 3824;BNKS Lwmn over Deadwood River?

It is owned by the County Highway Agency.