US Bridges

CR 21B over Miami River

PoorClosed to traffic

Logan County, Ohio · .05 M W of CR 21 · Structure no. 4631838

Built
1882
143 years old, rebuilt 1997
Condition
Poor
inspected January 2025
Type
Truss - Thru
Steel
Length
143 ft
1 main span
Daily traffic
816
2015 count
Owner
County
County Highway Agency

About this bridge

CR 21B over Miami River is a steel truss - thru carrying CR 21B over Miami River in Logan County, Ohio. It was built in 1882 and reconstructed in 1997, so it is 143 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. Its operating status is: closed to all traffic.

It carries about 816 vehicles a day, roughly 7% of them trucks, projected to reach 1,133 by 2035. The structure is 143 ft (43.6 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCR 21B
CrossesMiami River
Location.05 M W of CR 21
RouteCounty Highway C0021
CountyLogan County
StateOhio
Coordinates40.35117, -83.93833
Functional classRural Local

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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length143 ft (43.6 m)
Longest span140 ft (42.7 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deck17 ft (5 m)

Traffic and service

Average daily traffic816 (2015)
Projected traffic1,133 by 2035
Trucks7%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 21B over Miami River built?

It was built in 1882, making it 143 years old in 2025. It was reconstructed in 1997.

What condition is CR 21B over Miami River 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 January 2025.

How much traffic does CR 21B over Miami River carry?

About 816 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is CR 21B over Miami River?

The structure is 143 ft (43.6 m) long with a longest span of 140 ft (42.7 m) and a deck 16 ft wide.

Who owns CR 21B over Miami River?

It is owned by the County Highway Agency.