OLD MAMALAHOA HWY
Carrying OLD MAMALAHOA HWY over OPEA STREAM
TMK: 3-2-001:018, Hawaii, Hawaii
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: OLD MAMALAHOA HWY
The OLD MAMALAHOA HWY bridge in Hawaii, Hawaii carries OLD MAMALAHOA HWY over OPEA STREAM. It was built in 1912, making it 114 years old today. The structure is built primarily of concrete and spans 1 section, stretching 12.8 meters (42 feet) end to end. Daily traffic averages 20 vehicles, placing it in the lower-traffic tier of Hawaii bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 4/9, substructure at 6/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order. Its NBI inventory load rating is 10.7 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How OLD MAMALAHOA HWY compares
Live comparison across Hawaii.
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 How the historical reference is calculated.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
- 1912
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 12.8 m (42 ft)
- Deck Width
- 5.7 m (19 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 20 vehicles/day
- Structure Number
- 001310001100002
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates poor at 4/9, advanced deterioration that should be prioritized for repair.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
How to read this record
OLD MAMALAHOA HWY is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare OLD MAMALAHOA HWY against other structures in Hawaii and across Hawaii. Hawaii 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 OLD MAMALAHOA HWY?
OLD MAMALAHOA HWY in Hawaii, Hawaii has a deck rating of 6/9, superstructure rating of 4/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is OLD MAMALAHOA HWY inspected?
OLD MAMALAHOA HWY'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 20 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. OLD MAMALAHOA HWY is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for OLD MAMALAHOA HWY?
OLD MAMALAHOA HWY has an NBI inventory load rating of 10.7 metric tons.
Who is responsible for maintaining OLD MAMALAHOA HWY?
OLD MAMALAHOA HWY is owned and maintained by County Highway Agency.
How old is OLD MAMALAHOA HWY and does age affect safety?
OLD MAMALAHOA HWY was built in 1912, making it 114 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.