US Bridges

Is 70 W over Blackwater Rvr

Fair

Saline County, Missouri · S 4 T 48 N R 21 W · Structure no. 4668

Built
1947
78 years old, rebuilt 2015
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
723 ft
3 main spans
Daily traffic
15,511
2024 count
Owner
State
State Highway Agency

About this bridge

Is 70 W over Blackwater Rvr is a steel continuous stringer/multi-beam or girder carrying Is 70 W over Blackwater Rvr in Saline County, Missouri. It was built in 1947 and reconstructed in 2015, so it is 78 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 6 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 15,511 vehicles a day, roughly 35% of them trucks, projected to reach 27,144 by 2044. The structure is 723 ft (220.4 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 70 W
CrossesBlackwater Rvr
LocationS 4 T 48 N R 21 W
RouteInterstate 70
CountySaline County
StateMissouri
Coordinates38.96748, -93.22511
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+8 approach)
Design loadHS 20
Structure length723 ft (220.4 m)
Longest span115 ft (35.1 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,511 (2024)
Projected traffic27,144 by 2044
Trucks35%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 70 W over Blackwater Rvr built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 2015.

What condition is Is 70 W over Blackwater Rvr 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 September 2023.

How much traffic does Is 70 W over Blackwater Rvr carry?

About 15,511 vehicles per day (2024 count), of which roughly 35% are trucks.

How long is Is 70 W over Blackwater Rvr?

The structure is 723 ft (220.4 m) long with a longest span of 115 ft (35.1 m) and a deck 41 ft wide.

Who owns Is 70 W over Blackwater Rvr?

It is owned by the State Highway Agency.