US Bridges

Malt Road over Deer Flat Highline Cnl

FairPosted for load

Canyon County, Idaho · 2.2 N. 3.0 E. Marsing · Structure no. 000000000027520

Built
1981
44 years old, rebuilt 2001
Condition
Fair
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
330
2023 count
Owner
Local
Other Local Agency

About this bridge

Malt Road over Deer Flat Highline Cnl is a prestressed concrete tee beam carrying Malt Road over Deer Flat Highline Cnl in Canyon County, Idaho. It was built in 1981 and reconstructed in 2001, so it is 44 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. Its operating status is: posted for load restriction.

It carries about 330 vehicles a day, projected to reach 495 by 2042. The structure is 35 ft (10.7 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMalt Road
CrossesDeer Flat Highline Cnl
Location2.2 N. 3.0 E. Marsing
RouteCounty Highway 0
CountyCanyon County
StateIdaho
Coordinates43.57778, -116.75247
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
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 geometry7: Better than present minimum criteria
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 typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span33 ft (10.1 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic330 (2023)
Projected traffic495 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$423,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Malt Road over Deer Flat Highline Cnl built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2001.

What condition is Malt Road over Deer Flat Highline Cnl 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 March 2024.

How much traffic does Malt Road over Deer Flat Highline Cnl carry?

About 330 vehicles per day (2023 count).

How long is Malt Road over Deer Flat Highline Cnl?

The structure is 35 ft (10.7 m) long with a longest span of 33 ft (10.1 m) and a deck 36 ft wide.

Who owns Malt Road over Deer Flat Highline Cnl?

It is owned by the Other Local Agency.