US Bridges

N Territorial RD over US-23

Good

Washtenaw County, Michigan · 3.7 MI S of Livingston CO · Structure no. 000000000010881

Built
2017
8 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
180 ft
2 main spans
Daily traffic
9,666
1993 count
Owner
State
State Highway Agency

About this bridge

N Territorial RD over US-23 is a prestressed concrete stringer/multi-beam or girder carrying N Territorial RD over US-23 in Washtenaw County, Michigan. It was built in 2017, so it is 8 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 9,666 vehicles a day, roughly 3% of them trucks, projected to reach 11,116 by 2013. The structure is 180 ft (54.9 m) long and 46 ft wide.

CarriesN Territorial RD
CrossesUS-23
Location3.7 MI S of Livingston CO
RouteCounty Highway 8184
Coordinates42.3794, -83.7568
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.
Superstructure9 ExcellentNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating42.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length180 ft (54.9 m)
Longest span88 ft (26.7 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,666 (1993)
Projected traffic11,116 by 2013
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was N Territorial RD over US-23 built?

It was built in 2017, making it 8 years old in 2025.

What condition is N Territorial RD over US-23 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 October 2023.

How much traffic does N Territorial RD over US-23 carry?

About 9,666 vehicles per day (1993 count), of which roughly 3% are trucks.

How long is N Territorial RD over US-23?

The structure is 180 ft (54.9 m) long with a longest span of 88 ft (26.7 m) and a deck 46 ft wide.

Who owns N Territorial RD over US-23?

It is owned by the State Highway Agency.