US Bridges

County Road 174 over Trb Mongaup River

Fair

Sullivan County, New York · 1.7 MI NW of Monticello · Structure no. 000000003356230

Built
1929
96 years old, rebuilt 1984
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
1,336
2018 count
Owner
County
County Highway Agency

About this bridge

County Road 174 over Trb Mongaup River is a concrete slab carrying County Road 174 over Trb Mongaup River in Sullivan County, New York. It was built in 1929 and reconstructed in 1984, so it is 96 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 1,336 vehicles a day, roughly 6% of them trucks, projected to reach 1,622 by 2041. The structure is 26 ft (7.9 m) long and 40 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesCounty Road 174
CrossesTrb Mongaup River
Location1.7 MI NW of Monticello
RouteCounty Highway 0
CountySullivan County
StateNew York
Coordinates41.68631, -74.72099
Functional classUrban Minor Arterial

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.
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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating80 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,336 (2018)
Projected traffic1,622 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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$731,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 174 over Trb Mongaup River built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1984.

What condition is County Road 174 over Trb 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 April 2024.

How much traffic does County Road 174 over Trb Mongaup River carry?

About 1,336 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is County Road 174 over Trb Mongaup River?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 40 ft wide.

Who owns County Road 174 over Trb Mongaup River?

It is owned by the County Highway Agency.