US Bridges

US 183 NB over SH 45/FM 620 Interchange

Fair

Williamson County, Texas · Interchange SH 45/FM 620 · Structure no. 142460015105106

Built
2003
22 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
591 ft
6 main spans
Daily traffic
51,620
2019 count
Owner
State
State Highway Agency

About this bridge

US 183 NB over SH 45/FM 620 Interchange is a prestressed concrete stringer/multi-beam or girder carrying US 183 NB over SH 45/FM 620 Interchange in Williamson County, Texas. It was built in 2003, so it is 22 years old, younger than the Texas average of 44.4 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 51,620 vehicles a day, roughly 2% of them trucks, projected to reach 72,268 by 2039. The structure is 591 ft (180.1 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 183 NB
CrossesSH 45/FM 620 Interchange
LocationInterchange SH 45/FM 620
RouteU.S. Route 183
CountyWilliamson County
StateTexas
Coordinates30.46859, -97.79685
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans6
Design loadHS 20
Structure length591 ft (180.1 m)
Longest span98 ft (30 m)
Deck width71 ft (21.7 m)
Roadway width68 ft (20.6 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic51,620 (2019)
Projected traffic72,268 by 2039
Trucks2%
Lanes on structure4
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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 US 183 NB over SH 45/FM 620 Interchange built?

It was built in 2003, making it 22 years old in 2025.

What condition is US 183 NB over SH 45/FM 620 Interchange 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 February 2023.

How much traffic does US 183 NB over SH 45/FM 620 Interchange carry?

About 51,620 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is US 183 NB over SH 45/FM 620 Interchange?

The structure is 591 ft (180.1 m) long with a longest span of 98 ft (30 m) and a deck 71 ft wide.

Who owns US 183 NB over SH 45/FM 620 Interchange?

It is owned by the State Highway Agency.