US Bridges

Iowa LN over Brazos Riv Auth Canal

PoorPosted for load

Brazoria County, Texas · 0.25 MI S of SH 6 · Structure no. 120200W00195002

Built
1988
37 years old
Condition
Poor
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
43 ft
3 main spans
Daily traffic
520
2018 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Iowa LN over Brazos Riv Auth Canal is a wood or timber stringer/multi-beam or girder carrying Iowa LN over Brazos Riv Auth Canal in Brazoria County, Texas. It was built in 1988, so it is 37 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 520 vehicles a day, projected to reach 660 by 2038. The structure is 43 ft (13.1 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesIowa LN
CrossesBrazos Riv Auth Canal
Location0.25 MI S of SH 6
RouteCity Street 0
StateTexas
Coordinates29.473, -95.38532
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating20 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length43 ft (13.1 m)
Longest span14 ft (4.3 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic520 (2018)
Projected traffic660 by 2038
Trucks0%
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Iowa LN over Brazos Riv Auth Canal built?

It was built in 1988, making it 37 years old in 2025.

What condition is Iowa LN over Brazos Riv Auth Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.

How much traffic does Iowa LN over Brazos Riv Auth Canal carry?

About 520 vehicles per day (2018 count).

How long is Iowa LN over Brazos Riv Auth Canal?

The structure is 43 ft (13.1 m) long with a longest span of 14 ft (4.3 m) and a deck 20 ft wide.

Who owns Iowa LN over Brazos Riv Auth Canal?

It is owned by the Town or Township Highway Agency.