US Bridges

N 4075 E over Marysville Canal

Poor

Fremont County, Idaho · 0.1 N. 3.7 E. Marysville · Structure no. 000000000031855

Built
1976
49 years old
Condition
Poor
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
10
2023 count
Owner
County
County Highway Agency

About this bridge

N 4075 E over Marysville Canal is a prestressed concrete tee beam carrying N 4075 E over Marysville Canal in Fremont County, Idaho. It was built in 1976, so it is 49 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 10 vehicles a day, roughly 10% of them trucks, projected to reach 15 by 2039. The structure is 25 ft (7.6 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN 4075 E
CrossesMarysville Canal
Location0.1 N. 3.7 E. Marysville
RouteCounty Highway 0
CountyFremont County
StateIdaho
Coordinates44.07358, -111.34014
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic15 by 2039
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$312,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 4075 E over Marysville Canal built?

It was built in 1976, making it 49 years old in 2025.

What condition is N 4075 E over Marysville Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does N 4075 E over Marysville Canal carry?

About 10 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is N 4075 E over Marysville Canal?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 16 ft wide.

Who owns N 4075 E over Marysville Canal?

It is owned by the County Highway Agency.