US Bridges

RTE 20 over Slippery Rock Creek

Good

Chautauqua County, New York · RTE 20 + Slippery Rock Ck · Structure no. 000000001079890

Built
2017
8 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
32 ft
1 main span
Daily traffic
5,065
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 20 over Slippery Rock Creek is a concrete culvert carrying RTE 20 over Slippery Rock Creek in Chautauqua County, New York. It was built in 2017, so it is 8 years old, younger than the New York average of 53 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 5,065 vehicles a day, roughly 6% of them trucks, projected to reach 5,113 by 2041. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesRTE 20
CrossesSlippery Rock Creek
LocationRTE 20 + Slippery Rock Ck
RouteState Highway 20
CountyChautauqua County
StateNew York
Coordinates42.39043, -79.43538
Functional classRural Principal Arterial - Other

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.
Culvert9 ExcellentNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck107 ft (32.7 m)

Traffic and service

Average daily traffic5,065 (2020)
Projected traffic5,113 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 20 over Slippery Rock Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is RTE 20 over Slippery Rock 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 May 2023.

How much traffic does RTE 20 over Slippery Rock Creek carry?

About 5,065 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is RTE 20 over Slippery Rock Creek?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m).

Who owns RTE 20 over Slippery Rock Creek?

It is owned by the State Highway Agency.