US Bridges

SR-429 NB over Lake Markham Road

Good

Seminole County, Florida · SR-429NB Lake Markham RD · Structure no. 770104

Built
2022
3 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
360 ft
2 main spans
Daily traffic
15,000
2024 count
Owner
State
State Highway Agency

About this bridge

SR-429 NB over Lake Markham Road is a prestressed concrete stringer/multi-beam or girder carrying SR-429 NB over Lake Markham Road in Seminole County, Florida. It was built in 2022, so it is 3 years old, younger than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15,000 vehicles a day, roughly 10% of them trucks, projected to reach 18,120 by 2042. The structure is 360 ft (109.7 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR-429 NB
CrossesLake Markham Road
LocationSR-429NB Lake Markham RD
RouteState Highway 429
CountySeminole County
StateFlorida
Coordinates28.81308, -81.38808
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length360 ft (109.7 m)
Longest span179 ft (54.6 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2024)
Projected traffic18,120 by 2042
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll 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 SR-429 NB over Lake Markham Road built?

It was built in 2022, making it 3 years old in 2025.

What condition is SR-429 NB over Lake Markham Road in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does SR-429 NB over Lake Markham Road carry?

About 15,000 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is SR-429 NB over Lake Markham Road?

The structure is 360 ft (109.7 m) long with a longest span of 179 ft (54.6 m) and a deck 47 ft wide.

Who owns SR-429 NB over Lake Markham Road?

It is owned by the State Highway Agency.