US Bridges

US 20 over Unknown Creek

Good

Ashtabula County, Ohio · 0.98 MI E of SR 534 · Structure no. 0402088

Built
2016
9 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
55 ft
1 main span
Daily traffic
9,000
2020 count
Owner
State
State Highway Agency

About this bridge

US 20 over Unknown Creek is a concrete culvert carrying US 20 over Unknown Creek in Ashtabula County, Ohio. It was built in 2016, so it is 9 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,000 vehicles a day, roughly 9% of them trucks, projected to reach 9,297 by 2040. The structure is 55 ft (16.7 m) long. If it were closed, the detour would be 11.2 mi (18 km).

CarriesUS 20
CrossesUnknown Creek
Location0.98 MI E of SR 534
RouteU.S. Route 20
StateOhio
Coordinates41.81056, -80.92945
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length55 ft (16.7 m)
Longest span53 ft (16.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2020)
Projected traffic9,297 by 2040
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 over Unknown Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is US 20 over Unknown Creek 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 September 2024.

How much traffic does US 20 over Unknown Creek carry?

About 9,000 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is US 20 over Unknown Creek?

The structure is 55 ft (16.7 m) long with a longest span of 53 ft (16.2 m).

Who owns US 20 over Unknown Creek?

It is owned by the State Highway Agency.