US Bridges

Township Road 66 over Mill Creek * Allowa

FairPosted for load

Washington County, Ohio · .25 MI N of Int SR 7 · Structure no. 8432619

Built
1955
70 years old
Condition
Fair
inspected October 2024
Type
Truss - Thru
Steel
Length
50 ft
1 main span
Daily traffic
209
2015 count
Owner
County
County Highway Agency

About this bridge

Township Road 66 over Mill Creek * Allowa is a steel truss - thru carrying Township Road 66 over Mill Creek * Allowa in Washington County, Ohio. It was built in 1955, so it is 70 years old, older than the Ohio average of 47.3 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 209 vehicles a day, roughly 7% of them trucks, projected to reach 290 by 2035. The structure is 50 ft (15.2 m) long and 16 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesTownship Road 66
CrossesMill Creek * Allowa
Location.25 MI N of Int SR 7
RouteCounty Highway T0066
CountyWashington County
StateOhio
Coordinates39.5356, -81.05345
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
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 12 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating32.2 US tons
Inventory rating21.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span45 ft (13.6 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic209 (2015)
Projected traffic290 by 2035
Trucks7%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Township Road 66 over Mill Creek * Allowa built?

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

What condition is Township Road 66 over Mill Creek * Allowa 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 October 2024.

How much traffic does Township Road 66 over Mill Creek * Allowa carry?

About 209 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is Township Road 66 over Mill Creek * Allowa?

The structure is 50 ft (15.2 m) long with a longest span of 45 ft (13.6 m) and a deck 16 ft wide.

Who owns Township Road 66 over Mill Creek * Allowa?

It is owned by the County Highway Agency.