US Bridges

RTE 20A over Tonawanda Creek

Fair

Wyoming County, New York · 0.1 MI W JCT Rts 20A + 98 · Structure no. 000000001016130

Built
1985
40 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
112 ft
1 main span
Daily traffic
3,581
2021 count
Owner
State
State Highway Agency

About this bridge

RTE 20A over Tonawanda Creek is a prestressed concrete box beam or girders - multiple carrying RTE 20A over Tonawanda Creek in Wyoming County, New York. It was built in 1985, so it is 40 years old, younger 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 5 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 3,581 vehicles a day, roughly 9% of them trucks, projected to reach 3,603 by 2041. The structure is 112 ft (34.1 m) long and 37 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesRTE 20A
CrossesTonawanda Creek
Location0.1 MI W JCT Rts 20A + 98
RouteU.S. Route 20A
Coordinates42.76334, -78.31433
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating40.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span107 ft (32.6 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,581 (2021)
Projected traffic3,603 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

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$1.9 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 20A over Tonawanda Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is RTE 20A over Tonawanda Creek 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 June 2024.

How much traffic does RTE 20A over Tonawanda Creek carry?

About 3,581 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is RTE 20A over Tonawanda Creek?

The structure is 112 ft (34.1 m) long with a longest span of 107 ft (32.6 m) and a deck 37 ft wide.

Who owns RTE 20A over Tonawanda Creek?

It is owned by the State Highway Agency.