US Bridges

9 Mile Road over Thornton Creek

Good

Oakland County, Michigan · 0.06 MI E of Novi RD · Structure no. 000000000014275

Built
1990
35 years old
Condition
Good
inspected September 2024
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
11,126
2012 count
Owner
City
City or Municipal Highway Agency

About this bridge

9 Mile Road over Thornton Creek is a steel culvert carrying 9 Mile Road over Thornton Creek in Oakland County, Michigan. It was built in 1990, so it is 35 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 11,126 vehicles a day, projected to reach 12,800 by 2032. The structure is 22 ft (6.6 m) long.

Location

Open in Google Maps
Carries9 Mile Road
CrossesThornton Creek
Location0.06 MI E of Novi RD
RouteCity Street 0
CountyOakland County
StateMichigan
Coordinates42.45217, -83.47292
Functional classUrban Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating76.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.6 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,126 (2012)
Projected traffic12,800 by 2032
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 9 Mile Road over Thornton Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is 9 Mile Road over Thornton 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 September 2024.

How much traffic does 9 Mile Road over Thornton Creek carry?

About 11,126 vehicles per day (2012 count).

How long is 9 Mile Road over Thornton Creek?

The structure is 22 ft (6.6 m) long with a longest span of 10 ft (3 m).

Who owns 9 Mile Road over Thornton Creek?

It is owned by the City or Municipal Highway Agency.