US Bridges

Chalmers RD over Pittsfield Ann Arbor Drn

Good

Washtenaw County, Michigan · Ann Arbor Twp Sec 35 · Structure no. 000000000011031

Built
1951
74 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
350
2015 count
Owner
County
County Highway Agency

About this bridge

Chalmers RD over Pittsfield Ann Arbor Drn is a concrete slab carrying Chalmers RD over Pittsfield Ann Arbor Drn in Washtenaw County, Michigan. It was built in 1951, so it is 74 years old, older 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 350 vehicles a day, roughly 4% of them trucks, projected to reach 681 by 2026. The structure is 25 ft (7.6 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesChalmers RD
CrossesPittsfield Ann Arbor Drn
LocationAnn Arbor Twp Sec 35
RouteCounty Highway 0
Coordinates42.26467, -83.68838
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.7 US tons
Inventory rating30.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width34 ft (10.4 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2015)
Projected traffic681 by 2026
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$160,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Chalmers RD over Pittsfield Ann Arbor Drn built?

It was built in 1951, making it 74 years old in 2025.

What condition is Chalmers RD over Pittsfield Ann Arbor Drn 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 June 2023.

How much traffic does Chalmers RD over Pittsfield Ann Arbor Drn carry?

About 350 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Chalmers RD over Pittsfield Ann Arbor Drn?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 34 ft wide.

Who owns Chalmers RD over Pittsfield Ann Arbor Drn?

It is owned by the County Highway Agency.