Load Ratings are performed to protect both the safety of traffic and the significant investment in the state’s bridge infrastructure. A Load Rating that reflects the current condition of each bridge provides a valuable tool that is used in identifying the:
- need for load posting or bridge strengthening,
- making overweight-vehicle permit decisions, and
- prioritize bridge repairs and replacements.
ODOT Bridge Section has implemented the Load and Resistance Factor Rating (LRFR) method, based on the 2011 AASHTO Manual for Bridge Evaluation (MBE) with the latest Interim Revisions. LRFR is a statistically-based, more accurate and defensible load rating than the previous method, now referred to as the Tier-1 Load Rating Procedures.
All bridges in Oregon (regardless of the owner) will be rated following the ODOT Load and Resistance Factor Rating (LRFR) Procedures. ODOT bridges will use the Oregon Specific Live Load Factors and all other bridges will use the re-calibrated National Live Load Factors.
Need More Information?
Call (503)-986-3357 or email ODOT’s Senior Load Rating Engineer Jon