US Bridges

Kilgore Road over Mill Creek

Fair

St. Clair County, Michigan · Sec. 15 Kenockee Twp. · Structure no. 000000000010092

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
240 ft
3 main spans
Daily traffic
1,095
2017 count
Owner
County
County Highway Agency

About this bridge

Kilgore Road over Mill Creek is a steel stringer/multi-beam or girder carrying Kilgore Road over Mill Creek in St. Clair County, Michigan. It was built in 1974, so it is 51 years old, older 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 5 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 1,095 vehicles a day, roughly 8% of them trucks, projected to reach 1,630 by 2037. The structure is 240 ft (73.1 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesKilgore Road
CrossesMill Creek
LocationSec. 15 Kenockee Twp.
RouteCounty Highway 7747
CountySt. Clair County
StateMichigan
Coordinates43.04264, -82.69343
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length240 ft (73.1 m)
Longest span88 ft (26.8 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,095 (2017)
Projected traffic1,630 by 2037
Trucks8%
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$7,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Kilgore Road over Mill Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Kilgore Road over Mill Creek 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 2023.

How much traffic does Kilgore Road over Mill Creek carry?

About 1,095 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is Kilgore Road over Mill Creek?

The structure is 240 ft (73.1 m) long with a longest span of 88 ft (26.8 m) and a deck 42 ft wide.

Who owns Kilgore Road over Mill Creek?

It is owned by the County Highway Agency.