Mo 77 S over Is 55
PoorScott County, Missouri · S 17 T 28 N R 14 E · Structure no. 681
- Built
- 1962
- 63 years old
- Condition
- Poor
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 250 ft
- 4 main spans
- Daily traffic
- 4,440
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 77 S over Is 55 is a steel continuous stringer/multi-beam or girder carrying Mo 77 S over Is 55 in Scott County, Missouri. It was built in 1962, so it is 63 years old, older than the Missouri average of 45.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 4,440 vehicles a day, roughly 8% of them trucks, projected to reach 6,438 by 2044. The structure is 250 ft (76.2 m) long and 31 ft wide. If it were closed, the detour would be 26.7 mi (43 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 77 S over Is 55 built?
It was built in 1962, making it 63 years old in 2025.
What condition is Mo 77 S over Is 55 in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.
How much traffic does Mo 77 S over Is 55 carry?
About 4,440 vehicles per day (2024 count), of which roughly 8% are trucks.
How long is Mo 77 S over Is 55?
The structure is 250 ft (76.2 m) long with a longest span of 76 ft (23.2 m) and a deck 31 ft wide.
Who owns Mo 77 S over Is 55?
It is owned by the State Highway Agency.