US Bridges

Mo 109 S over Hamilton CR

Fair

St. Louis County, Missouri · S 13 T 44 N R 3 E · Structure no. 4130

Built
1997
28 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
105 ft
3 main spans
Daily traffic
14,768
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 109 S over Hamilton CR is a concrete continuous culvert carrying Mo 109 S over Hamilton CR in St. Louis County, Missouri. It was built in 1997, so it is 28 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 14,768 vehicles a day, roughly 3% of them trucks, projected to reach 18,460 by 2044. The structure is 105 ft (32.1 m) long and 83 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesMo 109 S
CrossesHamilton CR
LocationS 13 T 44 N R 3 E
RouteState Highway 109
CountySt. Louis County
StateMissouri
Coordinates38.54641, -90.63
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length105 ft (32.1 m)
Longest span36 ft (11 m)
Deck width83 ft (25.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,768 (2024)
Projected traffic18,460 by 2044
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 109 S over Hamilton CR built?

It was built in 1997, making it 28 years old in 2025.

What condition is Mo 109 S over Hamilton CR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does Mo 109 S over Hamilton CR carry?

About 14,768 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Mo 109 S over Hamilton CR?

The structure is 105 ft (32.1 m) long with a longest span of 36 ft (11 m) and a deck 83 ft wide.

Who owns Mo 109 S over Hamilton CR?

It is owned by the State Highway Agency.