US Bridges

RTE 18 over East Branch of Twelve MI

Good

Niagara County, New York · .9 MI SW JCT SH18 & SH425 · Structure no. 000000001014660

Built
2003
22 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
92 ft
1 main span
Daily traffic
2,101
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 18 over East Branch of Twelve MI is a steel stringer/multi-beam or girder carrying RTE 18 over East Branch of Twelve MI in Niagara County, New York. It was built in 2003, so it is 22 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 2,101 vehicles a day, roughly 5% of them trucks, projected to reach 2,218 by 2041. The structure is 92 ft (28 m) long and 41 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesRTE 18
CrossesEast Branch of Twelve MI
Location.9 MI SW JCT SH18 & SH425
RouteState Highway 18
Coordinates43.30854, -78.83339
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating89.5 US tons
Inventory rating53.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length92 ft (28 m)
Longest span86 ft (26.2 m)
Deck width41 ft (12.4 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,101 (2020)
Projected traffic2,218 by 2041
Trucks5%
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

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$3.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 18 over East Branch of Twelve MI built?

It was built in 2003, making it 22 years old in 2025.

What condition is RTE 18 over East Branch of Twelve MI 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 2023.

How much traffic does RTE 18 over East Branch of Twelve MI carry?

About 2,101 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is RTE 18 over East Branch of Twelve MI?

The structure is 92 ft (28 m) long with a longest span of 86 ft (26.2 m) and a deck 41 ft wide.

Who owns RTE 18 over East Branch of Twelve MI?

It is owned by the State Highway Agency.