MO 99 S
Carrying MO 99 S over SPRING CR
S 20 T 26 N R 5 W, Shannon, Missouri
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: MO 99 S
The MO 99 S bridge in Shannon, Missouri carries MO 99 S over SPRING CR. It was built in 1934, making it 92 years old today. The structure is built primarily of steel and spans 5 sections, stretching 61.9 meters (203 feet) end to end. Daily traffic averages 530 vehicles, placing it in the lower-traffic tier of Missouri bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 4/9, superstructure at 5/9, substructure at 4/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 14.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How MO 99 S compares
Live comparison across Missouri.
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 How the historical reference is calculated.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
- 1934
- Material
- Steel
- Number of Spans
- 5
- Structure Length
- 61.9 m (203 ft)
- Deck Width
- 8.2 m (27 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 530 vehicles/day
- Structure Number
- 5740
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in poor condition (4/9), showing advanced deterioration that may require priority repair.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • At 4/9, the substructure (piers and abutments) is in poor shape, with advanced wear flagged for priority repair.
How to read this record
MO 99 S 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 MO 99 S against other structures in Shannon and across Missouri. Missouri 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 MO 99 S?
MO 99 S in Shannon, Missouri has a deck rating of 4/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is MO 99 S inspected?
MO 99 S'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 530 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. MO 99 S 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 MO 99 S?
MO 99 S has an NBI inventory load rating of 14.4 metric tons.
Who is responsible for maintaining MO 99 S?
MO 99 S is owned and maintained by State Highway Agency.
How old is MO 99 S and does age affect safety?
MO 99 S was built in 1934, making it 92 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.