US Bridges

Snyder Road over Purdy Marsh

FairPosted for load

Knox County, Indiana · 00.37 W of State Road 67 · Structure no. 4200177

Built
1955
70 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
39 ft
1 main span
Daily traffic
150
2015 count
Owner
County
County Highway Agency

About this bridge

Snyder Road over Purdy Marsh is a concrete tee beam carrying Snyder Road over Purdy Marsh in Knox County, Indiana. It was built in 1955, so it is 70 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 150 vehicles a day, roughly 4% of them trucks, projected to reach 200 by 2035. The structure is 39 ft (11.8 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSnyder Road
CrossesPurdy Marsh
Location00.37 W of State Road 67
RouteCounty Highway 0
CountyKnox County
StateIndiana
Coordinates38.78744, -87.27228
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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
ScourCountermeasures installed to correct a previously existing problem
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating22.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length39 ft (11.8 m)
Longest span35 ft (10.8 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2015)
Projected traffic200 by 2035
Trucks4%
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 Snyder Road over Purdy Marsh built?

It was built in 1955, making it 70 years old in 2025.

What condition is Snyder Road over Purdy Marsh 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 Snyder Road over Purdy Marsh carry?

About 150 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Snyder Road over Purdy Marsh?

The structure is 39 ft (11.8 m) long with a longest span of 35 ft (10.8 m) and a deck 27 ft wide.

Who owns Snyder Road over Purdy Marsh?

It is owned by the County Highway Agency.