US Bridges

Mill Hill RD over Meramec Rvr

Fair

Franklin County, Missouri · S 26 T 42 N R 1 E · Structure no. 20303

Built
1993
32 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
444 ft
3 main spans
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Mill Hill RD over Meramec Rvr is a steel continuous stringer/multi-beam or girder carrying Mill Hill RD over Meramec Rvr in Franklin County, Missouri. It was built in 1993, so it is 32 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 250 vehicles a day, roughly 17% of them trucks, projected to reach 450 by 2043. The structure is 444 ft (135.3 m) long and 27 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesMill Hill RD
CrossesMeramec Rvr
LocationS 26 T 42 N R 1 E
RouteCounty Highway 255
CountyFranklin County
StateMissouri
Coordinates38.34853, -90.88217
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length444 ft (135.3 m)
Longest span165 ft (50.3 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic450 by 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Mill Hill RD over Meramec Rvr built?

It was built in 1993, making it 32 years old in 2025.

What condition is Mill Hill RD over Meramec 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 January 2025.

How much traffic does Mill Hill RD over Meramec Rvr carry?

About 250 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is Mill Hill RD over Meramec Rvr?

The structure is 444 ft (135.3 m) long with a longest span of 165 ft (50.3 m) and a deck 27 ft wide.

Who owns Mill Hill RD over Meramec Rvr?

It is owned by the County Highway Agency.