US Bridges

RTE 20A over Stony Brook

Poor

Wyoming County, New York · 0.2MI S JCT Rts 98 + 20A · Structure no. 000000001016140

Built
1931
94 years old, rebuilt 2012
Condition
Poor
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
55 ft
1 main span
Daily traffic
4,434
2021 count
Owner
State
State Highway Agency

About this bridge

RTE 20A over Stony Brook is a steel stringer/multi-beam or girder carrying RTE 20A over Stony Brook in Wyoming County, New York. It was built in 1931 and reconstructed in 2012, so it is 94 years old, older than the New York average of 53 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4,434 vehicles a day, roughly 10% of them trucks, projected to reach 4,461 by 2041. The structure is 55 ft (16.8 m) long and 39 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesRTE 20A
CrossesStony Brook
Location0.2MI S JCT Rts 98 + 20A
RouteU.S. Route 20A
Coordinates42.75974, -78.31131
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating48 US tons
Inventory rating29 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length55 ft (16.8 m)
Longest span53 ft (16.1 m)
Deck width39 ft (11.8 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,434 (2021)
Projected traffic4,461 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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$1.8 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 20A over Stony Brook built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 2012.

What condition is RTE 20A over Stony Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does RTE 20A over Stony Brook carry?

About 4,434 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is RTE 20A over Stony Brook?

The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.1 m) and a deck 39 ft wide.

Who owns RTE 20A over Stony Brook?

It is owned by the State Highway Agency.