INTERSTATE 580 over ALAMO CANAL

Map 

Facts 

Name:	INTERSTATE 580 over ALAMO CANAL
Structure number:	33 0016R
Location:	04-ALA-580-20.56-PLE
Purpose:	Carries highway over waterway
Route classification:	Principal Arterial - Interstate (Urban) [11]
Length of largest span:	22.0 ft. [6.7 m]
Total length:	150.9 ft. [46.0 m]
Roadway width between curbs:	66.6 ft. [20.3 m]
Deck width edge-to-edge:	66.6 ft. [20.3 m]
Owner:	State Highway Agency [01]
Year built:	1952
Year reconstructed:	1965
Historic significance:	Bridge is not eligible for the National Register of Historic Places [5]
Design load:	MS 18 / HS 20 [5]
Number of main spans:	7
Main spans material:	Concrete continuous [2]
Main spans design:	Slab [01]
Deck type:	Concrete Cast-in-Place [1]
Wearing surface:	Monolithic Concrete (concurrently placed with structural deck) [1]

2010 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	88,500 [as of 2000]
Truck traffic:	14% of total traffic
Deck condition:	Satisfactory [6 out of 9]
Superstructure condition:	Good [7 out of 9]
Substructure condition:	Satisfactory [6 out of 9]
Channel protection:	Bank protection is in need of minor repairs. River control devices and embankment protection have a little minor damage. Banks and/or channel have minor amounts of drift. [7]
Scour condition:	Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Operating rating:	56.9 tons [51.7 metric tons]
Inventory rating:	36.9 tons [33.5 metric tons]
Sufficiency rating:	85.0

2000 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	79,450 [as of 1997]
Truck traffic:	10% of total traffic
Deck condition:	Imminent Failure [1 out of 9]
Superstructure condition:	Poor [4 out of 9]
Substructure condition:	Good [7 out of 9]
Channel protection:	Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:	Scour calculation/evaluation has not been made. [6]
Operating rating:	56.9 tons [51.7 metric tons]
Inventory rating:	36.9 tons [33.5 metric tons]
Evaluation:	Structurally deficient [1]
Sufficiency rating:	52.0
Recommended work:	Bridge deck replacement with only incidental widening. [37]
Estimated cost of work:	$1,154,000

1992 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	72,500 [as of 1990]
Truck traffic:	14% of total traffic
Deck condition:	Poor [4 out of 9]
Superstructure condition:	Satisfactory [6 out of 9]
Substructure condition:	Poor [4 out of 9]
Channel protection:	Bank protection is being eroded. River control devices and/or embankment have major damage. Trees and rush restrict the channel. [5]
Scour condition:	Scour calculation/evaluation has not been made. [6]
Operating rating:	56.4 tons [51.3 metric tons]
Inventory rating:	36.6 tons [33.3 metric tons]
Evaluation:	Structurally deficient [1]
Sufficiency rating:	55.0
Recommended work:	Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:	$699,000

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