US Bridges

IH 45 SB over Griggs Broad Myrtle RR

Fair

Harris County, Texas · 0.75 MI SE of US 90A · Structure no. 121020050003363

Built
1950
75 years old, rebuilt 1983
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
1,115 ft
21 main spans
Daily traffic
98,792
2017 count
Owner
State
State Highway Agency

About this bridge

IH 45 SB over Griggs Broad Myrtle RR is a steel stringer/multi-beam or girder carrying IH 45 SB over Griggs Broad Myrtle RR in Harris County, Texas. It was built in 1950 and reconstructed in 1983, so it is 75 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 98,792 vehicles a day, roughly 7% of them trucks, projected to reach 111,310 by 2033. The structure is 1,115 ft (339.9 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIH 45 SB
CrossesGriggs Broad Myrtle RR
Location0.75 MI SE of US 90A
RouteInterstate 45
CountyHarris County
StateTexas
Coordinates29.70841, -95.30546
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans21 (+2 approach)
Design loadOther
Structure length1,115 ft (339.9 m)
Longest span52 ft (15.9 m)
Deck width71 ft (21.5 m)
Roadway width57 ft (17.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98,792 (2017)
Projected traffic111,310 by 2033
Trucks7%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$156,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 45 SB over Griggs Broad Myrtle RR built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1983.

What condition is IH 45 SB over Griggs Broad Myrtle RR 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 IH 45 SB over Griggs Broad Myrtle RR carry?

About 98,792 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is IH 45 SB over Griggs Broad Myrtle RR?

The structure is 1,115 ft (339.9 m) long with a longest span of 52 ft (15.9 m) and a deck 71 ft wide.

Who owns IH 45 SB over Griggs Broad Myrtle RR?

It is owned by the State Highway Agency.