US Bridges

Walnut RD over Potato Creek

PoorPosted for load

St. Joseph County, Indiana · 00.30 N of Quinn RD · Structure no. 7100093

Built
1968
57 years old, rebuilt 1977
Condition
Poor
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
386
2021 count
Owner
County
County Highway Agency

About this bridge

Walnut RD over Potato Creek is a prestressed concrete box beam or girders - multiple carrying Walnut RD over Potato Creek in St. Joseph County, Indiana. It was built in 1968 and reconstructed in 1977, so it is 57 years old, older than the Indiana average of 46.6 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 386 vehicles a day, roughly 9% of them trucks, projected to reach 697 by 2041. The structure is 55 ft (16.7 m) long and 28 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesWalnut RD
CrossesPotato Creek
Location00.30 N of Quinn RD
RouteCounty Highway 0
StateIndiana
Coordinates41.52417, -86.477
Functional classRural Minor Collector

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
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.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating24.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length55 ft (16.7 m)
Longest span43 ft (13.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic386 (2021)
Projected traffic697 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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$1.4 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Walnut RD over Potato Creek built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1977.

What condition is Walnut RD over Potato Creek 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 September 2024.

How much traffic does Walnut RD over Potato Creek carry?

About 386 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is Walnut RD over Potato Creek?

The structure is 55 ft (16.7 m) long with a longest span of 43 ft (13.1 m) and a deck 28 ft wide.

Who owns Walnut RD over Potato Creek?

It is owned by the County Highway Agency.