US Bridges

CR 1100N over Branch of Flatrock River

FairPosted for load

Rush County, Indiana · 00.30 W of CR 600 E · Structure no. 7000045

Built
1935
90 years old
Condition
Fair
inspected April 2023
Type
Girder and Floorbeam System
Concrete
Length
27 ft
1 main span
Daily traffic
100
2019 count
Owner
County
County Highway Agency

About this bridge

CR 1100N over Branch of Flatrock River is a concrete girder and floorbeam system carrying CR 1100N over Branch of Flatrock River in Rush County, Indiana. It was built in 1935, so it is 90 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 100 vehicles a day, roughly 5% of them trucks, projected to reach 150 by 2039. The structure is 27 ft (8.2 m) long and 21 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesCR 1100N
CrossesBranch of Flatrock River
Location00.30 W of CR 600 E
RouteCounty Highway 78
CountyRush County
StateIndiana
Coordinates39.7732, -85.34153
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.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating13 US tons
Inventory rating13 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span25 ft (7.7 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2019)
Projected traffic150 by 2039
Trucks5%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$892,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 1100N over Branch of Flatrock River built?

It was built in 1935, making it 90 years old in 2025.

What condition is CR 1100N over Branch of Flatrock 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 April 2023.

How much traffic does CR 1100N over Branch of Flatrock River carry?

About 100 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is CR 1100N over Branch of Flatrock River?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.7 m) and a deck 21 ft wide.

Who owns CR 1100N over Branch of Flatrock River?

It is owned by the County Highway Agency.