US Bridges

Rockland Avenue over Mnrr Nh Line

PoorPosted for load

Westchester County, New York · In Mamaroneck Village · Structure no. 000000007700460

Built
1900
125 years old, rebuilt 2009
Condition
Poor
inspected December 2024
Type
Truss - Thru
Steel
Length
98 ft
1 main span
Daily traffic
4,041
2017 count
Owner
Railroad
Railroad

About this bridge

Rockland Avenue over Mnrr Nh Line is a steel truss - thru carrying Rockland Avenue over Mnrr Nh Line in Westchester County, New York. It was built in 1900 and reconstructed in 2009, so it is 125 years old, older than the New York average of 53 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 4,041 vehicles a day, roughly 4% of them trucks, projected to reach 4,999 by 2041. The structure is 98 ft (29.9 m) long and 52 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesRockland Avenue
CrossesMnrr Nh Line
LocationIn Mamaroneck Village
Coordinates40.94603, -73.74529
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating17 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadUnknown
Structure length98 ft (29.9 m)
Longest span56 ft (17 m)
Deck width52 ft (15.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,041 (2017)
Projected traffic4,999 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byTown or Township Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$10 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rockland Avenue over Mnrr Nh Line built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2009.

What condition is Rockland Avenue over Mnrr Nh Line in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does Rockland Avenue over Mnrr Nh Line carry?

About 4,041 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Rockland Avenue over Mnrr Nh Line?

The structure is 98 ft (29.9 m) long with a longest span of 56 ft (17 m) and a deck 52 ft wide.

Who owns Rockland Avenue over Mnrr Nh Line?

It is owned by the Railroad and maintained by the Town or Township Highway Agency.