US Bridges

SH 317 over N Tonk Creek

Fair

McLennan County, Texas · 8.1 MI N of US 84 · Structure no. 091610039802017

Built
1947
78 years old
Condition
Fair
inspected January 2023
Type
Slab
Concrete Continuous
Length
110 ft
4 main spans
Daily traffic
2,123
2020 count
Owner
State
State Highway Agency

About this bridge

SH 317 over N Tonk Creek is a concrete continuous slab carrying SH 317 over N Tonk Creek in McLennan County, Texas. It was built in 1947, so it is 78 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 2,123 vehicles a day, roughly 14% of them trucks, projected to reach 2,810 by 2037. The structure is 110 ft (33.5 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSH 317
CrossesN Tonk Creek
Location8.1 MI N of US 84
RouteState Highway 317
CountyMcLennan County
StateTexas
Coordinates31.54323, -97.4452
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length110 ft (33.5 m)
Longest span30 ft (9.1 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,123 (2020)
Projected traffic2,810 by 2037
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 317 over N Tonk Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is SH 317 over N Tonk Creek 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 January 2023.

How much traffic does SH 317 over N Tonk Creek carry?

About 2,123 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is SH 317 over N Tonk Creek?

The structure is 110 ft (33.5 m) long with a longest span of 30 ft (9.1 m) and a deck 29 ft wide.

Who owns SH 317 over N Tonk Creek?

It is owned by the State Highway Agency.