US Bridges

RTE 20 over Eighteenmile Crk

Fair

Erie County, New York · 5.6 MI SW JCT Rts 20 + 75 · Structure no. 000000001015450

Built
1929
96 years old, rebuilt 2000
Condition
Fair
inspected July 2024
Type
Arch - Deck
Concrete Continuous
Length
416 ft
5 main spans
Daily traffic
12,165
2021 count
Owner
State
State Highway Agency

About this bridge

RTE 20 over Eighteenmile Crk is a concrete continuous arch - deck carrying RTE 20 over Eighteenmile Crk in Erie County, New York. It was built in 1929 and reconstructed in 2000, so it is 96 years old, older than the New York average of 53 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 12,165 vehicles a day, roughly 6% of them trucks, projected to reach 12,222 by 2041. The structure is 416 ft (126.8 m) long and 59 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRTE 20
CrossesEighteenmile Crk
Location5.6 MI SW JCT Rts 20 + 75
RouteU.S. Route 20
CountyErie County
StateNew York
Coordinates42.69609, -78.93599
Functional classUrban Other Principal Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.1 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length416 ft (126.8 m)
Longest span147 ft (44.8 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,165 (2021)
Projected traffic12,222 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$21.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 20 over Eighteenmile Crk built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2000.

What condition is RTE 20 over Eighteenmile Crk 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 July 2024.

How much traffic does RTE 20 over Eighteenmile Crk carry?

About 12,165 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is RTE 20 over Eighteenmile Crk?

The structure is 416 ft (126.8 m) long with a longest span of 147 ft (44.8 m) and a deck 59 ft wide.

Who owns RTE 20 over Eighteenmile Crk?

It is owned by the State Highway Agency.