US Bridges

STC4783;DENT Br RD over N.Fk.Clearwater;dent Br

Fair

Clearwater County, Idaho · 8.8N. 3.7E.OROFINO · Structure no. 000000000020295

Built
1971
54 years old
Condition
Fair
inspected October 2024
Type
Suspension
Steel
Length
1,558 ft
3 main spans
Daily traffic
190
2023 count
Owner
County
County Highway Agency

About this bridge

STC4783;DENT Br RD over N.Fk.Clearwater;dent Br is a steel suspension carrying STC4783;DENT Br RD over N.Fk.Clearwater;dent Br in Clearwater County, Idaho. It was built in 1971, so it is 54 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 190 vehicles a day, roughly 6% of them trucks, projected to reach 285 by 2042. The structure is 1,558 ft (474.9 m) long and 39 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

Open in Google Maps
CarriesSTC4783;DENT Br RD
CrossesN.Fk.Clearwater;dent Br
Location8.8N. 3.7E.OROFINO
RouteCounty Highway 4783
CountyClearwater County
StateIdaho
Coordinates46.60056, -116.17917
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment7: Better than present minimum criteria
Operating rating45.6 US tons
Inventory rating32.7 US tons

Structure

Structure typeSuspension
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length1,558 ft (474.9 m)
Longest span1,050 ft (320 m)
Deck width39 ft (11.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck25 ft (7.8 m)

Traffic and service

Average daily traffic190 (2023)
Projected traffic285 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed70.2 mi (113 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11.6 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was STC4783;DENT Br RD over N.Fk.Clearwater;dent Br built?

It was built in 1971, making it 54 years old in 2025.

What condition is STC4783;DENT Br RD over N.Fk.Clearwater;dent 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 October 2024.

How much traffic does STC4783;DENT Br RD over N.Fk.Clearwater;dent Br carry?

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

How long is STC4783;DENT Br RD over N.Fk.Clearwater;dent Br?

The structure is 1,558 ft (474.9 m) long with a longest span of 1,050 ft (320 m) and a deck 39 ft wide.

Who owns STC4783;DENT Br RD over N.Fk.Clearwater;dent Br?

It is owned by the County Highway Agency.