US Bridges

N 2850 E Road over Butte Market Lake Canal

Fair

Jefferson County, Idaho · 0.2 N. Roberts · Structure no. 000000000032280

Built
1931
94 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

N 2850 E Road over Butte Market Lake Canal is a concrete tee beam carrying N 2850 E Road over Butte Market Lake Canal in Jefferson County, Idaho. It was built in 1931, so it is 94 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 30 vehicles a day, roughly 5% of them trucks, projected to reach 45 by 2039. The structure is 44 ft (13.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesN 2850 E Road
CrossesButte Market Lake Canal
Location0.2 N. Roberts
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.72875, -112.12947
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMarch 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating21.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$465,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 2850 E Road over Butte Market Lake Canal built?

It was built in 1931, making it 94 years old in 2025.

What condition is N 2850 E Road over Butte 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 March 2023.

How much traffic does N 2850 E Road over Butte Market Lake Canal carry?

About 30 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is N 2850 E Road over Butte Market Lake Canal?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 28 ft wide.

Who owns N 2850 E Road over Butte Market Lake Canal?

It is owned by the County Highway Agency.