US Bridges

RTE 18 over Eighteen Mile Crk

Fair

Niagara County, New York · JCT SH 18 & SH 78 · Structure no. 000000001014680

Built
1971
54 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
529 ft
4 main spans
Daily traffic
1,199
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 18 over Eighteen Mile Crk is a steel continuous stringer/multi-beam or girder carrying RTE 18 over Eighteen Mile Crk in Niagara County, New York. It was built in 1971, so it is 54 years old, older 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 1,199 vehicles a day, roughly 7% of them trucks, projected to reach 1,266 by 2041. The structure is 529 ft (161.2 m) long and 58 ft wide. If it were closed, the detour would be 15.5 mi (25 km).

Location

Open in Google Maps
CarriesRTE 18
CrossesEighteen Mile Crk
LocationJCT SH 18 & SH 78
RouteState Highway 18
CountyNiagara County
StateNew York
Coordinates43.33532, -78.71555
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadOther
Structure length529 ft (161.2 m)
Longest span160 ft (48.7 m)
Deck width58 ft (17.8 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,199 (2020)
Projected traffic1,266 by 2041
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed15.5 mi (25 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$18.8 million (2024 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was RTE 18 over Eighteen Mile Crk built?

It was built in 1971, making it 54 years old in 2025.

What condition is RTE 18 over Eighteen Mile Crk 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 July 2023.

How much traffic does RTE 18 over Eighteen Mile Crk carry?

About 1,199 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is RTE 18 over Eighteen Mile Crk?

The structure is 529 ft (161.2 m) long with a longest span of 160 ft (48.7 m) and a deck 58 ft wide.

Who owns RTE 18 over Eighteen Mile Crk?

It is owned by the State Highway Agency.