US Bridges

IH 20 Mn Lns over Trib of Thurber Lake

Fair

Erath County, Texas · 1.3 MI W of SH 108 South · Structure no. 020730031404121

Built
1970
55 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
22,458
2020 count
Owner
State
State Highway Agency

About this bridge

IH 20 Mn Lns over Trib of Thurber Lake is a concrete culvert carrying IH 20 Mn Lns over Trib of Thurber Lake in Erath County, Texas. It was built in 1970, so it is 55 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 22,458 vehicles a day, roughly 28% of them trucks, projected to reach 26,670 by 2033. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIH 20 Mn Lns
CrossesTrib of Thurber Lake
Location1.3 MI W of SH 108 South
RouteInterstate 20
CountyErath County
StateTexas
Coordinates32.50918, -98.39468
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,458 (2020)
Projected traffic26,670 by 2033
Trucks28%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was IH 20 Mn Lns over Trib of Thurber Lake built?

It was built in 1970, making it 55 years old in 2025.

What condition is IH 20 Mn Lns over Trib of Thurber Lake 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 April 2023.

How much traffic does IH 20 Mn Lns over Trib of Thurber Lake carry?

About 22,458 vehicles per day (2020 count), of which roughly 28% are trucks.

How long is IH 20 Mn Lns over Trib of Thurber Lake?

The structure is 22 ft (6.7 m) long with a longest span of 7 ft (2.1 m).

Who owns IH 20 Mn Lns over Trib of Thurber Lake?

It is owned by the State Highway Agency.