US Bridges

Pilot Knob Road over Slick Run

FairPosted for load

Crawford County, Indiana · 0.0 E of Slick Creek Road · Structure no. 1300022

Built
1935
90 years old, rebuilt 1989
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
120
2023 count
Owner
County
County Highway Agency

About this bridge

Pilot Knob Road over Slick Run is a steel stringer/multi-beam or girder carrying Pilot Knob Road over Slick Run in Crawford County, Indiana. It was built in 1935 and reconstructed in 1989, 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 120 vehicles a day, roughly 10% of them trucks, projected to reach 250 by 2043. The structure is 31 ft (9.4 m) long and 18 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesPilot Knob Road
CrossesSlick Run
Location0.0 E of Slick Creek Road
RouteCounty Highway 0
CountyCrawford County
StateIndiana
Coordinates38.31662, -86.30722
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.9 US tons
Inventory rating10 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span29 ft (8.9 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2023)
Projected traffic250 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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$445,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Pilot Knob Road over Slick Run built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1989.

What condition is Pilot Knob Road over Slick Run 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 2023.

How much traffic does Pilot Knob Road over Slick Run carry?

About 120 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Pilot Knob Road over Slick Run?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.9 m) and a deck 18 ft wide.

Who owns Pilot Knob Road over Slick Run?

It is owned by the County Highway Agency.