US Bridges

SH 171 / FM 51 over IH 20

Fair

Parker County, Texas · 1.05 MI E of FM 1884 · Structure no. 021840031407051

Built
1968
57 years old, rebuilt 2011
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
2 main spans
Daily traffic
29,636
2024 count
Owner
State
State Highway Agency

About this bridge

SH 171 / FM 51 over IH 20 is a prestressed concrete stringer/multi-beam or girder carrying SH 171 / FM 51 over IH 20 in Parker County, Texas. It was built in 1968 and reconstructed in 2011, so it is 57 years old, older 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 29,636 vehicles a day, roughly 4% of them trucks, projected to reach 47,880 by 2042. The structure is 220 ft (67.1 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSH 171 / FM 51
CrossesIH 20
Location1.05 MI E of FM 1884
RouteState Highway 171
CountyParker County
StateTexas
Coordinates32.72964, -97.78952
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
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 rating60 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 20
Structure length220 ft (67.1 m)
Longest span65 ft (19.8 m)
Deck width80 ft (24.5 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,636 (2024)
Projected traffic47,880 by 2042
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 171 / FM 51 over IH 20 built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2011.

What condition is SH 171 / FM 51 over IH 20 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 2024.

How much traffic does SH 171 / FM 51 over IH 20 carry?

About 29,636 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is SH 171 / FM 51 over IH 20?

The structure is 220 ft (67.1 m) long with a longest span of 65 ft (19.8 m) and a deck 80 ft wide.

Who owns SH 171 / FM 51 over IH 20?

It is owned by the State Highway Agency.