US Bridges

Hamilton over Metrolink

PoorPosted for load

St. Louis city, Missouri · S 1201 T 45 N R 6 E · Structure no. 12949

Built
1936
89 years old
Condition
Poor
inspected April 2024
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
1,300
2023 count
Owner
County
County Highway Agency

About this bridge

Hamilton over Metrolink is a concrete continuous slab carrying Hamilton over Metrolink in St. Louis city, Missouri. It was built in 1936, so it is 89 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 1,300 vehicles a day, roughly 2% of them trucks, projected to reach 1,755 by 2043. The structure is 90 ft (27.4 m) long and 58 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesHamilton
CrossesMetrolink
LocationS 1201 T 45 N R 6 E
RouteCity Street 0
Coordinates38.65211, -90.29206
Functional classUrban Local

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
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 inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length90 ft (27.4 m)
Longest span34 ft (10.4 m)
Deck width58 ft (17.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2023)
Projected traffic1,755 by 2043
Trucks2%
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

OwnerCounty Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$998,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Hamilton over Metrolink built?

It was built in 1936, making it 89 years old in 2025.

What condition is Hamilton over Metrolink 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 April 2024.

How much traffic does Hamilton over Metrolink carry?

About 1,300 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Hamilton over Metrolink?

The structure is 90 ft (27.4 m) long with a longest span of 34 ft (10.4 m) and a deck 58 ft wide.

Who owns Hamilton over Metrolink?

It is owned by the County Highway Agency and maintained by the City or Municipal Highway Agency.