US Bridges

C.R. 21 over Great Miami River

Good

Logan County, Ohio · 0.36 MI East of C.R. 24 · Structure no. 4631839

Built
2020
5 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
157 ft
1 main span
Daily traffic
743
2019 count
Owner
County
County Highway Agency

About this bridge

C.R. 21 over Great Miami River is a steel stringer/multi-beam or girder carrying C.R. 21 over Great Miami River in Logan County, Ohio. It was built in 2020, so it is 5 years old, younger than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 743 vehicles a day, roughly 8% of them trucks, projected to reach 1,189 by 2039. The structure is 157 ft (47.9 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesC.R. 21
CrossesGreat Miami River
Location0.36 MI East of C.R. 24
RouteCounty Highway C0021
CountyLogan County
StateOhio
Coordinates40.35114, -83.93825
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating89.3 US tons
Inventory rating67.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length157 ft (47.9 m)
Longest span155 ft (47.2 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic743 (2019)
Projected traffic1,189 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-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 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 C.R. 21 over Great Miami River built?

It was built in 2020, making it 5 years old in 2025.

What condition is C.R. 21 over Great Miami River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2024.

How much traffic does C.R. 21 over Great Miami River carry?

About 743 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is C.R. 21 over Great Miami River?

The structure is 157 ft (47.9 m) long with a longest span of 155 ft (47.2 m) and a deck 36 ft wide.

Who owns C.R. 21 over Great Miami River?

It is owned by the County Highway Agency.