US Bridges

Tunnel Mill Road over Big Branch

Fair

Clark County, Indiana · 00.20 NE of Marion Martin · Structure no. 1000085

Built
2002
23 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
410
2018 count
Owner
County
County Highway Agency

About this bridge

Tunnel Mill Road over Big Branch is a steel stringer/multi-beam or girder carrying Tunnel Mill Road over Big Branch in Clark County, Indiana. It was built in 2002, so it is 23 years old, younger 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 6 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 410 vehicles a day, roughly 10% of them trucks, projected to reach 710 by 2038. The structure is 53 ft (16.3 m) long and 28 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesTunnel Mill Road
CrossesBig Branch
Location00.20 NE of Marion Martin
RouteCounty Highway 0
CountyClark County
StateIndiana
Coordinates38.48862, -85.61063
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating66.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length53 ft (16.3 m)
Longest span47 ft (14.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic410 (2018)
Projected traffic710 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 Tunnel Mill Road over Big Branch built?

It was built in 2002, making it 23 years old in 2025.

What condition is Tunnel Mill Road over Big Branch 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 March 2024.

How much traffic does Tunnel Mill Road over Big Branch carry?

About 410 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Tunnel Mill Road over Big Branch?

The structure is 53 ft (16.3 m) long with a longest span of 47 ft (14.4 m) and a deck 28 ft wide.

Who owns Tunnel Mill Road over Big Branch?

It is owned by the County Highway Agency.