US Bridges

Mo 135 S over Flat Creek

Poor

Morgan County, Missouri · S 28 T 45 N R 19 W · Structure no. 1529

Built
1966
59 years old
Condition
Poor
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
368 ft
3 main spans
Daily traffic
654
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 135 S over Flat Creek is a steel continuous stringer/multi-beam or girder carrying Mo 135 S over Flat Creek in Morgan County, Missouri. It was built in 1966, so it is 59 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 654 vehicles a day, roughly 4% of them trucks, projected to reach 1,210 by 2044. The structure is 368 ft (112.2 m) long and 29 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesMo 135 S
CrossesFlat Creek
LocationS 28 T 45 N R 19 W
RouteState Highway 135
Coordinates38.64131, -93.01508
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating17.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length368 ft (112.2 m)
Longest span145 ft (44.2 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic654 (2024)
Projected traffic1,210 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 135 S over Flat Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Mo 135 S over Flat Creek 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 December 2023.

How much traffic does Mo 135 S over Flat Creek carry?

About 654 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Mo 135 S over Flat Creek?

The structure is 368 ft (112.2 m) long with a longest span of 145 ft (44.2 m) and a deck 29 ft wide.

Who owns Mo 135 S over Flat Creek?

It is owned by the State Highway Agency.