US Bridges

100 No. St. Logan over Logan River

FairPosted for load

Cache County, Utah · 900 E. 100 N. Logan · Structure no. 005029C

Built
1960
65 years old, rebuilt 1975
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
2,520
2014 count
Owner
City
City or Municipal Highway Agency

About this bridge

100 No. St. Logan over Logan River is a steel stringer/multi-beam or girder carrying 100 No. St. Logan over Logan River in Cache County, Utah. It was built in 1960 and reconstructed in 1975, so it is 65 years old, older than the Utah average of 40.1 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 2,520 vehicles a day, roughly 2% of them trucks, projected to reach 3,062 by 2034. The structure is 35 ft (10.8 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries100 No. St. Logan
CrossesLogan River
Location900 E. 100 N. Logan
RouteCity Street 1196
CountyCache County
StateUtah
Coordinates41.73291, -111.81207
Functional classUrban 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.
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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length35 ft (10.8 m)
Longest span34 ft (10.3 m)
Deck width52 ft (16 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic2,520 (2014)
Projected traffic3,062 by 2034
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 100 No. St. Logan over Logan River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1975.

What condition is 100 No. St. Logan over Logan River 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 May 2024.

How much traffic does 100 No. St. Logan over Logan River carry?

About 2,520 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is 100 No. St. Logan over Logan River?

The structure is 35 ft (10.8 m) long with a longest span of 34 ft (10.3 m) and a deck 52 ft wide.

Who owns 100 No. St. Logan over Logan River?

It is owned by the City or Municipal Highway Agency.