HELLS GATE RD
Carrying HELLS GATE RD over TAMMANY CREEK
IN HELL'S GATE STATE PARK, Nez Perce, Idaho
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: HELLS GATE RD
The HELLS GATE RD bridge in Nez Perce, Idaho carries HELLS GATE RD over TAMMANY CREEK. It was built in 1959, making it 67 years old today. The structure is built primarily of steel and spans 1 section, stretching 12.8 meters (42 feet) end to end. Daily traffic averages 330 vehicles, placing it in the lower-traffic tier of Idaho bridges. It is owned and maintained by State Park/Forest/Reservation.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 14.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How HELLS GATE RD compares
Live comparison across Idaho.
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 How the historical reference is calculated.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
- 1959
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 12.8 m (42 ft)
- Deck Width
- 7.4 m (24 ft)
- Owner
- State Park/Forest/Reservation
- Avg Daily Traffic
- 330 vehicles/day
- Structure Number
- 000000000029975
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
How to read this record
This page shows what the last federal inspection recorded, not whether HELLS GATE 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 HELLS GATE RD against other structures in Nez Perce and across Idaho. Idaho 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 HELLS GATE RD?
HELLS GATE RD in Nez Perce, Idaho has a deck rating of 7/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is HELLS GATE RD inspected?
HELLS GATE RD's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 330 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. HELLS GATE RD is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for HELLS GATE RD?
HELLS GATE RD has an NBI inventory load rating of 14.5 metric tons.
Who is responsible for maintaining HELLS GATE RD?
HELLS GATE RD is owned and maintained by State Park/Forest/Reservation.
How old is HELLS GATE RD and does age affect safety?
HELLS GATE RD was built in 1959, making it 67 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.