US Bridges

RM 3404 over Llano River

Fair

Llano County, Texas · 1.50 MI W of RM 1431 · Structure no. 141500338801001

Built
1980
45 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
916
2020 count
Owner
State
State Highway Agency

About this bridge

RM 3404 over Llano River is a concrete culvert carrying RM 3404 over Llano River in Llano County, Texas. It was built in 1980, so it is 45 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 916 vehicles a day, roughly 5% of them trucks, projected to reach 1,300 by 2033. The structure is 43 ft (13.1 m) long and 26 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesRM 3404
CrossesLlano River
Location1.50 MI W of RM 1431
RouteState Highway 3404
CountyLlano County
StateTexas
Coordinates30.68162, -98.48526
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width26 ft (7.9 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic916 (2020)
Projected traffic1,300 by 2033
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3,000
NavigationNo navigation control on waterway

Frequently asked questions

When was RM 3404 over Llano River built?

It was built in 1980, making it 45 years old in 2025.

What condition is RM 3404 over Llano River 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 2024.

How much traffic does RM 3404 over Llano River carry?

About 916 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is RM 3404 over Llano River?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns RM 3404 over Llano River?

It is owned by the State Highway Agency.