US Bridges

RTE 21 over Big Creek

Good

Steuben County, New York · JCT SR 21 & CO RD 7 · Structure no. 000000001069431

Built
1976
49 years old, rebuilt 2014
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
89 ft
1 main span
Daily traffic
5,473
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 21 over Big Creek is a prestressed concrete stringer/multi-beam or girder carrying RTE 21 over Big Creek in Steuben County, New York. It was built in 1976 and reconstructed in 2014, so it is 49 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,473 vehicles a day, roughly 6% of them trucks, projected to reach 6,648 by 2041. The structure is 89 ft (27.1 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesRTE 21
CrossesBig Creek
LocationJCT SR 21 & CO RD 7
RouteState Highway 21
Coordinates42.35335, -77.66889
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating83 US tons
Inventory rating48 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length89 ft (27.1 m)
Longest span85 ft (25.9 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,473 (2020)
Projected traffic6,648 by 2041
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$2.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 21 over Big Creek built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2014.

What condition is RTE 21 over Big 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 RTE 21 over Big Creek carry?

About 5,473 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is RTE 21 over Big Creek?

The structure is 89 ft (27.1 m) long with a longest span of 85 ft (25.9 m) and a deck 44 ft wide.

Who owns RTE 21 over Big Creek?

It is owned by the State Highway Agency.