US Bridges

CR 100N over Tower Drain

Fair

Spencer County, Indiana · 00.64 W of SR 66 · Structure no. 7400233

Built
1929
96 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Concrete
Length
113 ft
1 main span
Daily traffic
890
2022 count
Owner
County
County Highway Agency

About this bridge

CR 100N over Tower Drain is a concrete arch - deck carrying CR 100N over Tower Drain in Spencer County, Indiana. It was built in 1929, so it is 96 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 890 vehicles a day, roughly 6% of them trucks, projected to reach 1,370 by 2042. The structure is 113 ft (34.4 m) long and 25 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesCR 100N
CrossesTower Drain
Location00.64 W of SR 66
RouteCounty Highway 306
CountySpencer County
StateIndiana
Coordinates37.90359, -87.24838
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.9 US tons
Inventory rating35.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length113 ft (34.4 m)
Longest span57 ft (17.3 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic890 (2022)
Projected traffic1,370 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 100N over Tower Drain built?

It was built in 1929, making it 96 years old in 2025.

What condition is CR 100N over Tower 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 September 2024.

How much traffic does CR 100N over Tower Drain carry?

About 890 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is CR 100N over Tower Drain?

The structure is 113 ft (34.4 m) long with a longest span of 57 ft (17.3 m) and a deck 25 ft wide.

Who owns CR 100N over Tower Drain?

It is owned by the County Highway Agency.