US Bridges

RTE 55 over Midd Mongaup Rvr

Fair

Sullivan County, New York · .5 Mile NE of Liberty · Structure no. 000000003355390

Built
1949
76 years old, rebuilt 1994
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
2,664
2017 count
Owner
County
County Highway Agency

About this bridge

RTE 55 over Midd Mongaup Rvr is a steel stringer/multi-beam or girder carrying RTE 55 over Midd Mongaup Rvr in Sullivan County, New York. It was built in 1949 and reconstructed in 1994, so it is 76 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 2,664 vehicles a day, roughly 7% of them trucks, projected to reach 3,296 by 2041. The structure is 36 ft (11 m) long and 28 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesRTE 55
CrossesMidd Mongaup Rvr
Location.5 Mile NE of Liberty
RouteCounty Highway 55
CountySullivan County
StateNew York
Coordinates41.80494, -74.73142
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span32 ft (9.7 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,664 (2017)
Projected traffic3,296 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$789,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 55 over Midd Mongaup Rvr built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1994.

What condition is RTE 55 over Midd Mongaup Rvr 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 August 2023.

How much traffic does RTE 55 over Midd Mongaup Rvr carry?

About 2,664 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is RTE 55 over Midd Mongaup Rvr?

The structure is 36 ft (11 m) long with a longest span of 32 ft (9.7 m) and a deck 28 ft wide.

Who owns RTE 55 over Midd Mongaup Rvr?

It is owned by the County Highway Agency.