US Bridges

CR 106 over Mankins Branch

Fair

Williamson County, Texas · 0.40 MI S of SH 29 · Structure no. 142460AA0492001

Built
1925
100 years old, rebuilt 1970
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
49 ft
2 main spans
Daily traffic
361
2020 count
Owner
County
County Highway Agency

About this bridge

CR 106 over Mankins Branch is a steel continuous stringer/multi-beam or girder carrying CR 106 over Mankins Branch in Williamson County, Texas. It was built in 1925 and reconstructed in 1970, so it is 100 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 5 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 361 vehicles a day, projected to reach 450 by 2030. The structure is 49 ft (14.9 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCR 106
CrossesMankins Branch
Location0.40 MI S of SH 29
RouteCounty Highway 106
CountyWilliamson County
StateTexas
Coordinates30.63821, -97.59846
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating57 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length49 ft (14.9 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic361 (2020)
Projected traffic450 by 2030
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3,000
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 106 over Mankins Branch built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1970.

What condition is CR 106 over Mankins Branch 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 October 2023.

How much traffic does CR 106 over Mankins Branch carry?

About 361 vehicles per day (2020 count).

How long is CR 106 over Mankins Branch?

The structure is 49 ft (14.9 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns CR 106 over Mankins Branch?

It is owned by the County Highway Agency.