LAKE IRWIN RD
Carrying LAKE IRWIN RD over IRWIN LAKE
3.2 MI. NE INT. 505, Morehouse, Louisiana
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: LAKE IRWIN RD
The LAKE IRWIN RD bridge in Morehouse, Louisiana carries LAKE IRWIN RD over IRWIN LAKE. It was built in 1978, making it 48 years old today. The structure is built primarily of steel and spans 16 sections, stretching 116.7 meters (383 feet) end to end. Daily traffic averages 150 vehicles, placing it in the lower-traffic tier of Louisiana bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 1/9. The weakest component sits in critical condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How LAKE IRWIN RD compares
Live comparison across Louisiana.
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 How the historical reference is calculated.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
- 1978
- Material
- Steel
- Number of Spans
- 16
- Structure Length
- 116.7 m (383 ft)
- Deck Width
- 7.3 m (24 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 150 vehicles/day
- Structure Number
- 053432337915031
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • The superstructure (beams and supports above the deck) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) rates critical at 1/9, severe deterioration that needs urgent attention.
How to read this record
LAKE IRWIN RD 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 LAKE IRWIN RD against other structures in Morehouse and across Louisiana. Louisiana 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 LAKE IRWIN RD?
LAKE IRWIN RD in Morehouse, Louisiana has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 1/9 on the FHWA's 0–9 scale.
How often is LAKE IRWIN RD inspected?
LAKE IRWIN 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 150 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. LAKE IRWIN RD 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 LAKE IRWIN RD?
An inventory load rating is not recorded for LAKE IRWIN RD.
Who is responsible for maintaining LAKE IRWIN RD?
LAKE IRWIN RD is owned and maintained by County Highway Agency.
How old is LAKE IRWIN RD and does age affect safety?
LAKE IRWIN RD was built in 1978, making it 48 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.