WYO 31
Carrying WYO 31 over Medicine Lodge Creek
Manderson - Hyattville, Big Horn, Wyoming
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: WYO 31
The WYO 31 bridge in Big Horn, Wyoming carries WYO 31 over Medicine Lodge Creek. It was built in 1948, making it 78 years old today. The structure is built primarily of concrete continuous and spans 3 sections, stretching 15.5 meters (51 feet) end to end. Daily traffic averages 216 vehicles, placing it in the lower-traffic tier of Wyoming bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 23.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How WYO 31 compares
Live comparison across Wyoming.
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 How the historical reference is calculated.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
- 1948
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 15.5 m (51 ft)
- Deck Width
- 9.5 m (31 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 216 vehicles/day
- Structure Number
- CJI
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 (7/9), showing no significant deterioration.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
How to read this record
This page shows what the last federal inspection recorded, not whether WYO 31 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 WYO 31 against other structures in Big Horn and across Wyoming. Wyoming 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 WYO 31?
WYO 31 in Big Horn, Wyoming has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is WYO 31 inspected?
WYO 31'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 216 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. WYO 31 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 WYO 31?
WYO 31 has an NBI inventory load rating of 23.2 metric tons.
Who is responsible for maintaining WYO 31?
WYO 31 is owned and maintained by State Highway Agency.
How old is WYO 31 and does age affect safety?
WYO 31 was built in 1948, making it 78 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.