US Bridges

County Road 77 over Mill Creek

Fair

Chautauqua County, New York · .4 MI N of Sinclairville · Structure no. 000000003323790

Built
1988
37 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
647
2021 count
Owner
County
County Highway Agency

About this bridge

County Road 77 over Mill Creek is a prestressed concrete box beam or girders - multiple carrying County Road 77 over Mill Creek in Chautauqua County, New York. It was built in 1988, so it is 37 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 647 vehicles a day, roughly 6% of them trucks, projected to reach 906 by 2041. The structure is 69 ft (20.9 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty Road 77
CrossesMill Creek
Location.4 MI N of Sinclairville
RouteCounty Highway 0
CountyChautauqua County
StateNew York
Coordinates42.28301, -79.24804
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating32.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length69 ft (20.9 m)
Longest span67 ft (20.4 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic647 (2021)
Projected traffic906 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 77 over Mill Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is County Road 77 over Mill 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 August 2023.

How much traffic does County Road 77 over Mill Creek carry?

About 647 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is County Road 77 over Mill Creek?

The structure is 69 ft (20.9 m) long with a longest span of 67 ft (20.4 m) and a deck 32 ft wide.

Who owns County Road 77 over Mill Creek?

It is owned by the County Highway Agency.