US Bridges

Ionia Road over Shanty Brook

Good

Eaton County, Michigan · 2.5 MI N of Kalamo · Structure no. 000000000002348

Built
1987
38 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
938
2016 count
Owner
County
County Highway Agency

About this bridge

Ionia Road over Shanty Brook is a prestressed concrete box beam or girders - multiple carrying Ionia Road over Shanty Brook in Eaton 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 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 938 vehicles a day, projected to reach 1,300 by 2046. The structure is 37 ft (11.2 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIonia Road
CrossesShanty Brook
Location2.5 MI N of Kalamo
RouteCounty Highway 2313
CountyEaton County
StateMichigan
Coordinates42.57148, -85.01417
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length37 ft (11.2 m)
Longest span36 ft (10.9 m)
Deck width37 ft (11.4 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic938 (2016)
Projected traffic1,300 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Ionia Road over Shanty Brook built?

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

What condition is Ionia Road over Shanty Brook 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 May 2023.

How much traffic does Ionia Road over Shanty Brook carry?

About 938 vehicles per day (2016 count).

How long is Ionia Road over Shanty Brook?

The structure is 37 ft (11.2 m) long with a longest span of 36 ft (10.9 m) and a deck 37 ft wide.

Who owns Ionia Road over Shanty Brook?

It is owned by the County Highway Agency.