US Bridges

Mill Road over Branch of Big Blue River

FairPosted for load

Henry County, Indiana · 00.01 N of CR 750 S · Structure no. 3300171

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
175
2019 count
Owner
County
County Highway Agency

About this bridge

Mill Road over Branch of Big Blue River is a steel culvert carrying Mill Road over Branch of Big Blue River in Henry County, Indiana. It was built in 1970, so it is 55 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 175 vehicles a day, roughly 6% of them trucks, projected to reach 275 by 2039. The structure is 22 ft (6.7 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMill Road
CrossesBranch of Big Blue River
Location00.01 N of CR 750 S
RouteCounty Highway 0
CountyHenry County
StateIndiana
Coordinates39.82351, -85.50403
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load 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 alignment6: Equal to present minimum criteria
Operating rating91.4 US tons
Inventory rating70 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 20
Structure length22 ft (6.7 m)
Longest span10 ft (2.9 m)
Deck width48 ft (14.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2019)
Projected traffic275 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Mill Road over Branch of Big Blue River built?

It was built in 1970, making it 55 years old in 2025.

What condition is Mill Road over Branch of Big Blue 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 July 2023.

How much traffic does Mill Road over Branch of Big Blue River carry?

About 175 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is Mill Road over Branch of Big Blue River?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (2.9 m) and a deck 48 ft wide.

Who owns Mill Road over Branch of Big Blue River?

It is owned by the County Highway Agency.