US Bridges

Old Bonhomme RD E over Is 170

Fair

St. Louis County, Missouri · S 5 T 45 N R 6 E · Structure no. 2421

Built
1960
65 years old, rebuilt 1998
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
254 ft
6 main spans
Daily traffic
2,364
2024 count
Owner
State
State Highway Agency

About this bridge

Old Bonhomme RD E over Is 170 is a steel continuous stringer/multi-beam or girder carrying Old Bonhomme RD E over Is 170 in St. Louis County, Missouri. It was built in 1960 and reconstructed in 1998, so it is 65 years old, older 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 2,364 vehicles a day, roughly 2% of them trucks, projected to reach 3,546 by 2044. The structure is 254 ft (77.3 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesOld Bonhomme RD E
CrossesIs 170
LocationS 5 T 45 N R 6 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.66786, -90.36115
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.4 US tons
Inventory rating47.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length254 ft (77.3 m)
Longest span58 ft (17.7 m)
Deck width52 ft (15.8 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,364 (2024)
Projected traffic3,546 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Old Bonhomme RD E over Is 170 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1998.

What condition is Old Bonhomme RD E over Is 170 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 October 2024.

How much traffic does Old Bonhomme RD E over Is 170 carry?

About 2,364 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Old Bonhomme RD E over Is 170?

The structure is 254 ft (77.3 m) long with a longest span of 58 ft (17.7 m) and a deck 52 ft wide.

Who owns Old Bonhomme RD E over Is 170?

It is owned by the State Highway Agency.