US Bridges

Prospect Street over Conrail Railroad

PoorPosted for load

Washtenaw County, Michigan · In City of Ypsilanti · Structure no. 000000000011092

Built
1979
46 years old
Condition
Poor
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
146 ft
3 main spans
Daily traffic
7,000
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

Prospect Street over Conrail Railroad is a prestressed concrete box beam or girders - multiple carrying Prospect Street over Conrail Railroad in Washtenaw County, Michigan. It was built in 1979, so it is 46 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 7,000 vehicles a day, projected to reach 8,400 by 2037. The structure is 146 ft (44.5 m) long and 61 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesProspect Street
CrossesConrail Railroad
LocationIn City of Ypsilanti
RouteCity Street 2006
Coordinates42.24226, -83.60225
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length146 ft (44.5 m)
Longest span52 ft (15.8 m)
Deck width61 ft (18.6 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2017)
Projected traffic8,400 by 2037
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Prospect Street over Conrail Railroad built?

It was built in 1979, making it 46 years old in 2025.

What condition is Prospect Street over Conrail Railroad in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Prospect Street over Conrail Railroad carry?

About 7,000 vehicles per day (2017 count).

How long is Prospect Street over Conrail Railroad?

The structure is 146 ft (44.5 m) long with a longest span of 52 ft (15.8 m) and a deck 61 ft wide.

Who owns Prospect Street over Conrail Railroad?

It is owned by the City or Municipal Highway Agency.