US Bridges

County Road 75 over Mid Mongaup River

Fair

Sullivan County, New York · .9 Mile SW of Harris · Structure no. 000000003355710

Built
1935
90 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
947
2020 count
Owner
County
County Highway Agency

About this bridge

County Road 75 over Mid Mongaup River is a steel stringer/multi-beam or girder carrying County Road 75 over Mid Mongaup River in Sullivan County, New York. It was built in 1935, so it is 90 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 5 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 947 vehicles a day, roughly 6% of them trucks, projected to reach 1,326 by 2040. The structure is 47 ft (14.3 m) long and 28 ft wide. If it were closed, the detour would be 10.6 mi (17 km).

Location

Open in Google Maps
CarriesCounty Road 75
CrossesMid Mongaup River
Location.9 Mile SW of Harris
RouteCounty Highway 0
CountySullivan County
StateNew York
Coordinates41.70759, -74.74099
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length47 ft (14.3 m)
Longest span46 ft (14 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic947 (2020)
Projected traffic1,326 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed10.6 mi (17 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$826,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 75 over Mid Mongaup River built?

It was built in 1935, making it 90 years old in 2025.

What condition is County Road 75 over Mid Mongaup River 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 June 2024.

How much traffic does County Road 75 over Mid Mongaup River carry?

About 947 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is County Road 75 over Mid Mongaup River?

The structure is 47 ft (14.3 m) long with a longest span of 46 ft (14 m) and a deck 28 ft wide.

Who owns County Road 75 over Mid Mongaup River?

It is owned by the County Highway Agency.