Necessary Dam Rd
Carrying Necessary Dam Rd over Stillwater Spillway Chan
19 Miles NW of Eagle Bay, Herkimer, New York
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: Necessary Dam Rd
The Necessary Dam Rd bridge in Herkimer, New York carries Necessary Dam Rd over Stillwater Spillway Chan. It was built in 2002, making it 24 years old today. The structure is built primarily of concrete and spans 1 section, stretching 11.3 meters (37 feet) end to end. Average daily traffic is not reported for this structure. It is owned and maintained by Other State Agencies.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 8/9, substructure at 8/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 50.8 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How Necessary Dam Rd compares
Live comparison across New York.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 2002
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 11.3 m (37 ft)
- Deck Width
- 6.1 m (20 ft)
- Owner
- Other State Agencies
- Structure Number
- 000000002271340
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in good condition (8/9), showing no significant deterioration.
- • The substructure (piers and abutments) is in good condition (8/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether Necessary Dam Rd is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare Necessary Dam Rd against other structures in Herkimer and across New York. New York bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for Necessary Dam Rd?
Necessary Dam Rd in Herkimer, New York has a deck rating of 7/9, superstructure rating of 8/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is Necessary Dam Rd inspected?
Necessary Dam Rd's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Necessary Dam Rd is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for Necessary Dam Rd?
Necessary Dam Rd has an NBI inventory load rating of 50.8 metric tons.
Who is responsible for maintaining Necessary Dam Rd?
Necessary Dam Rd is owned and maintained by Other State Agencies.
How old is Necessary Dam Rd and does age affect safety?
Necessary Dam Rd was built in 2002, making it 24 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.