US Bridges

S4718; Old Elk Cty over Elk Creek

Fair

Idaho County, Idaho · Elk Creek;w.Elk City Br · Structure no. 000000000029340

Built
1982
43 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
22 ft
1 main span
Daily traffic
480
2023 count
Owner
County
County Highway Agency

About this bridge

S4718; Old Elk Cty over Elk Creek is a prestressed concrete slab carrying S4718; Old Elk Cty over Elk Creek in Idaho County, Idaho. It was built in 1982, so it is 43 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 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 480 vehicles a day, roughly 2% of them trucks, projected to reach 720 by 2042. The structure is 22 ft (6.7 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS4718; Old Elk Cty
CrossesElk Creek
LocationElk Creek;w.Elk City Br
RouteCounty Highway 4718
CountyIdaho County
StateIdaho
Coordinates45.82731, -115.44194
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating30 US tons
Inventory rating18 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2023)
Projected traffic720 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$353,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S4718; Old Elk Cty over Elk Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is S4718; Old Elk Cty over Elk Creek 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 June 2023.

How much traffic does S4718; Old Elk Cty over Elk Creek carry?

About 480 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is S4718; Old Elk Cty over Elk Creek?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 30 ft wide.

Who owns S4718; Old Elk Cty over Elk Creek?

It is owned by the County Highway Agency.