US Bridges

Bryan RD S over Is 70

Fair

St. Charles County, Missouri · S 30 T 47 N R 2 E · Structure no. 4069

Built
1991
34 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
265 ft
2 main spans
Daily traffic
30,562
2024 count
Owner
State
State Highway Agency

About this bridge

Bryan RD S over Is 70 is a steel continuous stringer/multi-beam or girder carrying Bryan RD S over Is 70 in St. Charles County, Missouri. It was built in 1991, so it is 34 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.

It carries about 30,562 vehicles a day, roughly 5% of them trucks, projected to reach 55,012 by 2044. The structure is 265 ft (80.8 m) long and 85 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBryan RD S
CrossesIs 70
LocationS 30 T 47 N R 2 E
RouteCity Street 0
CountySt. Charles County
StateMissouri
Coordinates38.80309, -90.73316
Functional classUrban Other Principal Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length265 ft (80.8 m)
Longest span111 ft (33.9 m)
Deck width85 ft (25.8 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,562 (2024)
Projected traffic55,012 by 2044
Trucks5%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 Bryan RD S over Is 70 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Bryan RD S over Is 70 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 Bryan RD S over Is 70 carry?

About 30,562 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Bryan RD S over Is 70?

The structure is 265 ft (80.8 m) long with a longest span of 111 ft (33.9 m) and a deck 85 ft wide.

Who owns Bryan RD S over Is 70?

It is owned by the State Highway Agency.