US Bridges

Irons Road FH35 over Little Manistee River

Fair

Lake County, Michigan · 16 MI N of Baldwin · Structure no. 000000000005281

Built
1987
38 years old
Condition
Fair
inspected April 2024
Type
Slab
Wood or Timber
Length
72 ft
3 main spans
Daily traffic
930
2007 count
Owner
County
County Highway Agency

About this bridge

Irons Road FH35 over Little Manistee River is a wood or timber slab carrying Irons Road FH35 over Little Manistee River in Lake County, Michigan. It was built in 1987, so it is 38 years old, younger than the Michigan average of 48.3 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 930 vehicles a day, projected to reach 1,700 by 2027. The structure is 72 ft (21.9 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesIrons Road FH35
CrossesLittle Manistee River
Location16 MI N of Baldwin
RouteCounty Highway 4329
CountyLake County
StateMichigan
Coordinates44.08981, -85.90521
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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating73.5 US tons
Inventory rating52.9 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20 + Mod
Structure length72 ft (21.9 m)
Longest span24 ft (7.3 m)
Deck width35 ft (10.6 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic930 (2007)
Projected traffic1,700 by 2027
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Irons Road FH35 over Little Manistee River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Irons Road FH35 over Little Manistee 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 April 2024.

How much traffic does Irons Road FH35 over Little Manistee River carry?

About 930 vehicles per day (2007 count).

How long is Irons Road FH35 over Little Manistee River?

The structure is 72 ft (21.9 m) long with a longest span of 24 ft (7.3 m) and a deck 35 ft wide.

Who owns Irons Road FH35 over Little Manistee River?

It is owned by the County Highway Agency.