US Bridges

505-3330E over Grays Lake Outlet

FairPosted for load

Bingham County, Idaho · 2.4 S. 27.7 E. Firth · Structure no. 000000000023055

Built
1947
78 years old, rebuilt 1988
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
1 main span
Daily traffic
10
2023 count
Owner
County
County Highway Agency

About this bridge

505-3330E over Grays Lake Outlet is a wood or timber stringer/multi-beam or girder carrying 505-3330E over Grays Lake Outlet in Bingham County, Idaho. It was built in 1947 and reconstructed in 1988, so it is 78 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. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, projected to reach 15 by 2042. The structure is 32 ft (9.8 m) long and 24 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
Carries505-3330E
CrossesGrays Lake Outlet
Location2.4 S. 27.7 E. Firth
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.26841, -111.64358
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating30 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 15
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic15 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 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$375,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 505-3330E over Grays Lake Outlet built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1988.

What condition is 505-3330E over Grays Lake Outlet 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 2023.

How much traffic does 505-3330E over Grays Lake Outlet carry?

About 10 vehicles per day (2023 count).

How long is 505-3330E over Grays Lake Outlet?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 24 ft wide.

Who owns 505-3330E over Grays Lake Outlet?

It is owned by the County Highway Agency.