US Bridges

Mill Street over ST Joseph River

FairPosted for load

DeKalb County, Indiana · 00.40 E of SR 1 · Structure no. 1700004

Built
1873
152 years old, rebuilt 1981
Condition
Fair
inspected October 2024
Type
Truss - Thru
Wood or Timber
Length
225 ft
2 main spans
Daily traffic
200
2022 count
Owner
County
County Highway Agency

About this bridge

Mill Street over ST Joseph River is a wood or timber truss - thru carrying Mill Street over ST Joseph River in DeKalb County, Indiana. It was built in 1873 and reconstructed in 1981, so it is 152 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 200 vehicles a day, projected to reach 225 by 2042. The structure is 225 ft (68.6 m) long and 16 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMill Street
CrossesST Joseph River
Location00.40 E of SR 1
RouteCounty Highway 0
CountyDeKalb County
StateIndiana
Coordinates41.2814, -84.91461
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating3 US tons
Inventory rating3 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans2 (+3 approach)
Design loadUnknown
Structure length225 ft (68.6 m)
Longest span61 ft (18.5 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deck12 ft (3.8 m)

Traffic and service

Average daily traffic200 (2022)
Projected traffic225 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill Street over ST Joseph River built?

It was built in 1873, making it 152 years old in 2025. It was reconstructed in 1981.

What condition is Mill Street over ST Joseph River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does Mill Street over ST Joseph River carry?

About 200 vehicles per day (2022 count).

How long is Mill Street over ST Joseph River?

The structure is 225 ft (68.6 m) long with a longest span of 61 ft (18.5 m) and a deck 16 ft wide.

Who owns Mill Street over ST Joseph River?

It is owned by the County Highway Agency.