US Bridges

RTE 9N over Mill Brook

Fair

Essex County, New York · 9N North End Port Henry · Structure no. 000000001053580

Built
1993
32 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
153 ft
1 main span
Daily traffic
2,625
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 9N over Mill Brook is a steel stringer/multi-beam or girder carrying RTE 9N over Mill Brook in Essex County, New York. It was built in 1993, so it is 32 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 2,625 vehicles a day, roughly 13% of them trucks, projected to reach 2,941 by 2041. The structure is 153 ft (46.6 m) long and 41 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesRTE 9N
CrossesMill Brook
Location9N North End Port Henry
RouteU.S. Route 9N
CountyEssex County
StateNew York
Coordinates44.05388, -73.45652
Functional classRural Principal Arterial - Other

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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span150 ft (45.7 m)
Deck width41 ft (12.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,625 (2020)
Projected traffic2,941 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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$3.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 9N over Mill Brook built?

It was built in 1993, making it 32 years old in 2025.

What condition is RTE 9N over Mill Brook 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 9N over Mill Brook carry?

About 2,625 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is RTE 9N over Mill Brook?

The structure is 153 ft (46.6 m) long with a longest span of 150 ft (45.7 m) and a deck 41 ft wide.

Who owns RTE 9N over Mill Brook?

It is owned by the State Highway Agency.