US Bridges

Lll Road over Trout Falls Creek

Good

Marquette County, Michigan · 1.3 MI N of So Republic · Structure no. 000000000006606

Built
1935
90 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
31 ft
1 main span
Daily traffic
30
1994 count
Owner
County
County Highway Agency

About this bridge

Lll Road over Trout Falls Creek is a concrete culvert carrying Lll Road over Trout Falls Creek in Marquette County, Michigan. It was built in 1935, so it is 90 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, projected to reach 50 by 2020. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 124.3 mi (200 km).

Location

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CarriesLll Road
CrossesTrout Falls Creek
Location1.3 MI N of So Republic
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.38169, -87.97851
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.5 US tons
Inventory rating20.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (1994)
Projected traffic50 by 2020
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed124.3 mi (200 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lll Road over Trout Falls Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is Lll Road over Trout Falls Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Lll Road over Trout Falls Creek carry?

About 30 vehicles per day (1994 count).

How long is Lll Road over Trout Falls Creek?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m).

Who owns Lll Road over Trout Falls Creek?

It is owned by the County Highway Agency.