US Bridges

RTE 110 over Mill Dam Creek

Good

Suffolk County, New York · 0.6 MI N of Route 25A · Structure no. 000000001079260

Built
2012
13 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
28 ft
3 main spans
Daily traffic
9,334
2021 count
Owner
State
State Highway Agency

About this bridge

RTE 110 over Mill Dam Creek is a concrete culvert carrying RTE 110 over Mill Dam Creek in Suffolk County, New York. It was built in 2012, so it is 13 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,334 vehicles a day, roughly 4% of them trucks, projected to reach 11,338 by 2041. The structure is 28 ft (8.5 m) long and 65 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesRTE 110
CrossesMill Dam Creek
Location0.6 MI N of Route 25A
RouteState Highway 110
Coordinates40.87892, -73.42198
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.1 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckOpen grating
Main spans3
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span9 ft (2.7 m)
Deck width65 ft (19.8 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,334 (2021)
Projected traffic11,338 by 2041
Trucks4%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
Detour if closed0.6 mi (1 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$961,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was RTE 110 over Mill Dam Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is RTE 110 over Mill Dam Creek 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 March 2023.

How much traffic does RTE 110 over Mill Dam Creek carry?

About 9,334 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is RTE 110 over Mill Dam Creek?

The structure is 28 ft (8.5 m) long with a longest span of 9 ft (2.7 m) and a deck 65 ft wide.

Who owns RTE 110 over Mill Dam Creek?

It is owned by the State Highway Agency.