US Bridges

County Road 20 over Unadilla River

Fair

Otsego County, New York · Hamlet of South Edmeston · Structure no. 000000003354110

Built
1999
26 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
98 ft
1 main span
Daily traffic
999
2020 count
Owner
County
County Highway Agency

About this bridge

County Road 20 over Unadilla River is a prestressed concrete box beam or girders - multiple carrying County Road 20 over Unadilla River in Otsego County, New York. It was built in 1999, so it is 26 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 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 999 vehicles a day, roughly 8% of them trucks, projected to reach 1,042 by 2041. The structure is 98 ft (29.9 m) long and 33 ft wide. If it were closed, the detour would be 13.7 mi (22 km).

Location

Open in Google Maps
CarriesCounty Road 20
CrossesUnadilla River
LocationHamlet of South Edmeston
RouteCounty Highway 0
CountyOtsego County
StateNew York
Coordinates42.68463, -75.32003
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating48 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length98 ft (29.9 m)
Longest span97 ft (29.5 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic999 (2020)
Projected traffic1,042 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13.7 mi (22 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.7 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 20 over Unadilla River built?

It was built in 1999, making it 26 years old in 2025.

What condition is County Road 20 over Unadilla River 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 April 2023.

How much traffic does County Road 20 over Unadilla River carry?

About 999 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is County Road 20 over Unadilla River?

The structure is 98 ft (29.9 m) long with a longest span of 97 ft (29.5 m) and a deck 33 ft wide.

Who owns County Road 20 over Unadilla River?

It is owned by the County Highway Agency.