US Bridges

Gratiot Road over Richmond-Columbus Dn Ext

Good

St. Clair County, Michigan · Sec. 32 Columbus Twp. · Structure no. 000000000010043

Built
2015
10 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
7,209
2014 count
Owner
County
County Highway Agency

About this bridge

Gratiot Road over Richmond-Columbus Dn Ext is a concrete culvert carrying Gratiot Road over Richmond-Columbus Dn Ext in St. Clair County, Michigan. It was built in 2015, so it is 10 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 7,209 vehicles a day, roughly 8% of them trucks, projected to reach 10,700 by 2034. The structure is 28 ft (8.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesGratiot Road
CrossesRichmond-Columbus Dn Ext
LocationSec. 32 Columbus Twp.
RouteCounty Highway 7746
CountySt. Clair County
StateMichigan
Coordinates42.81868, -82.71248
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating55 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length28 ft (8.4 m)
Longest span26 ft (7.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,209 (2014)
Projected traffic10,700 by 2034
Trucks8%
Lanes on structure2
Traffic directionTwo-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 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 Gratiot Road over Richmond-Columbus Dn Ext built?

It was built in 2015, making it 10 years old in 2025.

What condition is Gratiot Road over Richmond-Columbus Dn Ext 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 December 2023.

How much traffic does Gratiot Road over Richmond-Columbus Dn Ext carry?

About 7,209 vehicles per day (2014 count), of which roughly 8% are trucks.

How long is Gratiot Road over Richmond-Columbus Dn Ext?

The structure is 28 ft (8.4 m) long with a longest span of 26 ft (7.8 m).

Who owns Gratiot Road over Richmond-Columbus Dn Ext?

It is owned by the County Highway Agency.