US Bridges

SH 48 over Market Lake Canal

Fair

Jefferson County, Idaho · In Roberts · Structure no. 000000000014435

Built
1968
57 years old
Condition
Fair
inspected April 2021
Type
Tee Beam
Concrete
Length
43 ft
1 main span
Daily traffic
3,000
2023 count
Owner
State
State Highway Agency

About this bridge

SH 48 over Market Lake Canal is a concrete tee beam carrying SH 48 over Market Lake Canal in Jefferson County, Idaho. It was built in 1968, so it is 57 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 6 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 3,000 vehicles a day, roughly 7% of them trucks, projected to reach 4,500 by 2042. The structure is 43 ft (13.1 m) long and 37 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesSH 48
CrossesMarket Lake Canal
LocationIn Roberts
RouteState Highway 48
CountyJefferson County
StateIdaho
Coordinates43.71711, -112.13267
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating59 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span42 ft (12.8 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2023)
Projected traffic4,500 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$663,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 48 over Market Lake Canal built?

It was built in 1968, making it 57 years old in 2025.

What condition is SH 48 over Market Lake Canal 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 April 2021.

How much traffic does SH 48 over Market Lake Canal carry?

About 3,000 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SH 48 over Market Lake Canal?

The structure is 43 ft (13.1 m) long with a longest span of 42 ft (12.8 m) and a deck 37 ft wide.

Who owns SH 48 over Market Lake Canal?

It is owned by the State Highway Agency.