US Bridges

RTE 77 over Unknown Stream

Fair

Genesee County, New York · 3.65 MI NW JCT Rts 63+77 · Structure no. 000000003095600

Built
1995
30 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
2,572
2021 count
Owner
County
County Highway Agency

About this bridge

RTE 77 over Unknown Stream is a concrete culvert carrying RTE 77 over Unknown Stream in Genesee County, New York. It was built in 1995, so it is 30 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 2,572 vehicles a day, roughly 13% of them trucks, projected to reach 2,683 by 2041. The structure is 27 ft (8.2 m) long and 60 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesRTE 77
CrossesUnknown Stream
Location3.65 MI NW JCT Rts 63+77
RouteCounty Highway 77
CountyGenesee County
StateNew York
Coordinates43.12034, -78.44867
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment7: Better than present minimum criteria
Operating rating82.5 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.6 m)
Deck width60 ft (18.3 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,572 (2021)
Projected traffic2,683 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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$516,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 77 over Unknown Stream built?

It was built in 1995, making it 30 years old in 2025.

What condition is RTE 77 over Unknown Stream 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 2023.

How much traffic does RTE 77 over Unknown Stream carry?

About 2,572 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is RTE 77 over Unknown Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.6 m) and a deck 60 ft wide.

Who owns RTE 77 over Unknown Stream?

It is owned by the County Highway Agency.