US Bridges

Oak ST over Mna RR Alley

PoorPosted for load

Jasper County, Missouri · S 4 T 28 N R 31 W · Structure no. 14646

Built
1920
105 years old
Condition
Poor
inspected February 2025
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
56 ft
3 main spans
Daily traffic
2,800
2023 count
Owner
Railroad
Railroad

About this bridge

Oak ST over Mna RR Alley is a wood or timber stringer/multi-beam or girder carrying Oak ST over Mna RR Alley in Jasper County, Missouri. It was built in 1920, so it is 105 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 3 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. Its operating status is: posted for load restriction.

It carries about 2,800 vehicles a day, roughly 10% of them trucks, projected to reach 4,200 by 2043. The structure is 56 ft (17.1 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesOak ST
CrossesMna RR Alley
LocationS 4 T 28 N R 31 W
RouteCity Street 0
CountyJasper County
StateMissouri
Coordinates37.17648, -94.3184
Functional classUrban Minor Arterial

Condition and inspection

Poor

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.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionFebruary 2025
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating6 US tons
Inventory rating4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadOther
Structure length56 ft (17.1 m)
Longest span18 ft (5.6 m)
Deck width33 ft (10.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic4,200 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byRailroad
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$758,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Oak ST over Mna RR Alley built?

It was built in 1920, making it 105 years old in 2025.

What condition is Oak ST over Mna RR Alley 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 February 2025.

How much traffic does Oak ST over Mna RR Alley carry?

About 2,800 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Oak ST over Mna RR Alley?

The structure is 56 ft (17.1 m) long with a longest span of 18 ft (5.6 m) and a deck 33 ft wide.

Who owns Oak ST over Mna RR Alley?

It is owned by the Railroad.