US Bridges

SH 99 Nbfr over Mason Creek

Fair

Harris County, Texas · 0.90 MI N of IH 10 · Structure no. 121020351005001

Built
1990
35 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
130 ft
3 main spans
Daily traffic
4,300
2013 count
Owner
State
State Highway Agency

About this bridge

SH 99 Nbfr over Mason Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 99 Nbfr over Mason Creek in Harris County, Texas. It was built in 1990, so it is 35 years old, younger 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 4,300 vehicles a day, projected to reach 9,300 by 2033. The structure is 130 ft (39.6 m) long and 46 ft wide.

Location

Open in Google Maps
CarriesSH 99 Nbfr
CrossesMason Creek
Location0.90 MI N of IH 10
RouteState Highway 99
CountyHarris County
StateTexas
Coordinates29.799, -95.77532
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span43 ft (13.1 m)
Deck width46 ft (14.1 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2013)
Projected traffic9,300 by 2033
Trucks0%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$13,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 99 Nbfr over Mason Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is SH 99 Nbfr over Mason 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 September 2024.

How much traffic does SH 99 Nbfr over Mason Creek carry?

About 4,300 vehicles per day (2013 count).

How long is SH 99 Nbfr over Mason Creek?

The structure is 130 ft (39.6 m) long with a longest span of 43 ft (13.1 m) and a deck 46 ft wide.

Who owns SH 99 Nbfr over Mason Creek?

It is owned by the State Highway Agency.