US Bridges

Is 170 W over NS RR Coldwater CR

FairPosted for load

St. Louis County, Missouri · S 2979 T 46 N R 6 E · Structure no. 2513

Built
1980
45 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
862 ft
11 main spans
Daily traffic
48,653
2024 count
Owner
State
State Highway Agency

About this bridge

Is 170 W over NS RR Coldwater CR is a steel continuous stringer/multi-beam or girder carrying Is 170 W over NS RR Coldwater CR in St. Louis County, Missouri. It was built in 1980, so it is 45 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 48,653 vehicles a day, roughly 18% of them trucks, projected to reach 60,816 by 2044. The structure is 862 ft (262.7 m) long and 59 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 170 W
CrossesNS RR Coldwater CR
LocationS 2979 T 46 N R 6 E
RouteInterstate 170
CountySt. Louis County
StateMissouri
Coordinates38.75731, -90.33876
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating34.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length862 ft (262.7 m)
Longest span92 ft (28 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48,653 (2024)
Projected traffic60,816 by 2044
Trucks18%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Is 170 W over NS RR Coldwater CR built?

It was built in 1980, making it 45 years old in 2025.

What condition is Is 170 W over NS RR Coldwater 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 August 2024.

How much traffic does Is 170 W over NS RR Coldwater CR carry?

About 48,653 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 170 W over NS RR Coldwater CR?

The structure is 862 ft (262.7 m) long with a longest span of 92 ft (28 m) and a deck 59 ft wide.

Who owns Is 170 W over NS RR Coldwater CR?

It is owned by the State Highway Agency.