US Bridges

RTE 30 over Big Brook

Poor

Hamilton County, New York · 3.9 MI NW JCT Rt 28N & 30 · Structure no. 000000001021250

Built
1938
87 years old, rebuilt 1988
Condition
Poor
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
55 ft
1 main span
Daily traffic
1,095
2016 count
Owner
State
State Highway Agency

About this bridge

RTE 30 over Big Brook is a steel stringer/multi-beam or girder carrying RTE 30 over Big Brook in Hamilton County, New York. It was built in 1938 and reconstructed in 1988, so it is 87 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.

It carries about 1,095 vehicles a day, roughly 20% of them trucks, projected to reach 1,181 by 2041. The structure is 55 ft (16.8 m) long and 33 ft wide. If it were closed, the detour would be 97.6 mi (157 km).

Location

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CarriesRTE 30
CrossesBig Brook
Location3.9 MI NW JCT Rt 28N & 30
RouteState Highway 30
CountyHamilton County
StateNew York
Coordinates44.00277, -74.48025
Functional classRural Principal Arterial - Other

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span54 ft (16.4 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,095 (2016)
Projected traffic1,181 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed97.6 mi (157 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$887,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 30 over Big Brook built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1988.

What condition is RTE 30 over Big Brook 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 July 2023.

How much traffic does RTE 30 over Big Brook carry?

About 1,095 vehicles per day (2016 count), of which roughly 20% are trucks.

How long is RTE 30 over Big Brook?

The structure is 55 ft (16.8 m) long with a longest span of 54 ft (16.4 m) and a deck 33 ft wide.

Who owns RTE 30 over Big Brook?

It is owned by the State Highway Agency.