US Bridges

Windmore RD over Natural Drain

Fair

Allen County, Indiana · 00.40 W Iron Bridge RD · Structure no. 0200308

Built
1976
49 years old
Condition
Fair
inspected May 2024
Type
Slab
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
16
2018 count
Owner
County
County Highway Agency

About this bridge

Windmore RD over Natural Drain is a prestressed concrete slab carrying Windmore RD over Natural Drain in Allen County, Indiana. It was built in 1976, so it is 49 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.

It carries about 16 vehicles a day, roughly 8% of them trucks, projected to reach 23 by 2038. The structure is 26 ft (7.9 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesWindmore RD
CrossesNatural Drain
Location00.40 W Iron Bridge RD
RouteCounty Highway 1570
CountyAllen County
StateIndiana
Coordinates40.98912, -85.30018
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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.3 US tons
Inventory rating37.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2018)
Projected traffic23 by 2038
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$57,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Windmore RD over Natural Drain built?

It was built in 1976, making it 49 years old in 2025.

What condition is Windmore RD over Natural Drain 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 May 2024.

How much traffic does Windmore RD over Natural Drain carry?

About 16 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is Windmore RD over Natural Drain?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 24 ft wide.

Who owns Windmore RD over Natural Drain?

It is owned by the County Highway Agency.