US Bridges

IH 45 NB over Griggs Broad Myrtle RR

Fair

Harris County, Texas · 0.75 MI SE of US 90A · Structure no. 121020050003010

Built
1950
75 years old, rebuilt 2019
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
1,116 ft
21 main spans
Daily traffic
82,717
2017 count
Owner
State
State Highway Agency

About this bridge

IH 45 NB over Griggs Broad Myrtle RR is a steel stringer/multi-beam or girder carrying IH 45 NB over Griggs Broad Myrtle RR in Harris County, Texas. It was built in 1950 and reconstructed in 2019, 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 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 82,717 vehicles a day, roughly 7% of them trucks, projected to reach 111,310 by 2033. The structure is 1,116 ft (340.2 m) long and 71 ft wide.

Location

Open in Google Maps
CarriesIH 45 NB
CrossesGriggs Broad Myrtle RR
Location0.75 MI SE of US 90A
RouteInterstate 45
CountyHarris County
StateTexas
Coordinates29.70852, -95.30526
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
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 length1,116 ft (340.2 m)
Longest span52 ft (15.9 m)
Deck width71 ft (21.5 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic82,717 (2017)
Projected traffic111,310 by 2033
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2019.

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

About 82,717 vehicles per day (2017 count), of which roughly 7% are trucks.

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

The structure is 1,116 ft (340.2 m) long with a longest span of 52 ft (15.9 m) and a deck 71 ft wide.

Who owns IH 45 NB over Griggs Broad Myrtle RR?

It is owned by the State Highway Agency.