US Bridges

SR 18 over East Branch of Black Riv

Fair

Huron County, Ohio · 2.3 MI East of SR60 · Structure no. 3900487

Built
1933
92 years old, rebuilt 1984
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
2,860
2015 count
Owner
State
State Highway Agency

About this bridge

SR 18 over East Branch of Black Riv is a steel stringer/multi-beam or girder carrying SR 18 over East Branch of Black Riv in Huron County, Ohio. It was built in 1933 and reconstructed in 1984, so it is 92 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,860 vehicles a day, roughly 20% of them trucks, projected to reach 3,970 by 2035. The structure is 85 ft (25.9 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR 18
CrossesEast Branch of Black Riv
Location2.3 MI East of SR60
RouteState Highway 18
CountyHuron County
StateOhio
Coordinates41.1823, -82.37012
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length85 ft (25.9 m)
Longest span80 ft (24.4 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,860 (2015)
Projected traffic3,970 by 2035
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$317,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 18 over East Branch of Black Riv built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1984.

What condition is SR 18 over East Branch of Black Riv 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 March 2024.

How much traffic does SR 18 over East Branch of Black Riv carry?

About 2,860 vehicles per day (2015 count), of which roughly 20% are trucks.

How long is SR 18 over East Branch of Black Riv?

The structure is 85 ft (25.9 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns SR 18 over East Branch of Black Riv?

It is owned by the State Highway Agency.