US Bridges

Swailes over Boone Creek

Poor

Miami County, Ohio · 0.45 E of CR149 · Structure no. 5534658

Built
1963
62 years old
Condition
Poor
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
84 ft
3 main spans
Daily traffic
2,062
2015 count
Owner
County
County Highway Agency

About this bridge

Swailes over Boone Creek is a prestressed concrete box beam or girders - multiple carrying Swailes over Boone Creek in Miami County, Ohio. It was built in 1963, so it is 62 years old, older than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,062 vehicles a day, roughly 5% of them trucks, projected to reach 2,862 by 2038. The structure is 84 ft (25.6 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSwailes
CrossesBoone Creek
Location0.45 E of CR149
RouteCounty Highway 137
StateOhio
Coordinates40.01167, -84.21167
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating36.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length84 ft (25.6 m)
Longest span28 ft (8.5 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,062 (2015)
Projected traffic2,862 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Swailes over Boone Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Swailes over Boone Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2025.

How much traffic does Swailes over Boone Creek carry?

About 2,062 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Swailes over Boone Creek?

The structure is 84 ft (25.6 m) long with a longest span of 28 ft (8.5 m) and a deck 24 ft wide.

Who owns Swailes over Boone Creek?

It is owned by the County Highway Agency.