NB I-29 over MAIN DITCH NO.6


+40.59444, -95.67222
40°35'40" N, 95°40'20" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:NB I-29 over MAIN DITCH NO.6
Structure number:000000000600030
Location:0.4 MI. S OF JCT. IA 333
Purpose:Carries highway over waterway
Route classification:Principal Arterial - Interstate (Rural) [01]
Length of largest span:74.2 ft. [22.6 m]
Total length:179.1 ft. [54.6 m]
Roadway width between curbs:40.0 ft. [12.2 m]
Deck width edge-to-edge:43.3 ft. [13.2 m]
Skew angle:52°
Owner:State Highway Agency [01]
Year built:1972
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:3
Main spans material:Steel continuous [4]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Low slump Concrete [4]

Latest Available Inspection: March 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:6,750 [as of 2015]
Truck traffic:34% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Fair [5 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Better than present minimum criteria [7]
Water adequacy appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Better than present minimum criteria [7]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:77.8 tons [70.7 metric tons]
Inventory rating:46.6 tons [42.4 metric tons]
Sufficiency rating:86.3

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
March 201686.3FairSatisfactoryFairFair-6750
March 201486.4FairSatisfactorySatisfactoryFair-5650
March 201286.4FairSatisfactorySatisfactoryFair-6000
March 201086.4FairSatisfactorySatisfactoryFair-5700
March 200870.3PoorSatisfactoryPoorFairSD4950
March 200667.1PoorSatisfactoryPoorFairSD5700
June 200494.3FairSatisfactorySatisfactoryGood-5700
May 200294.3FairSatisfactorySatisfactoryGood-6200
February 200094.4FairSatisfactorySatisfactoryGood-5300
October 199894.7FairSatisfactorySatisfactoryGood-4650
November 199694.7FairSatisfactorySatisfactoryGood-4800
April 199494.5FairSatisfactorySatisfactoryGood-4550
July 199267.4PoorSatisfactoryPoorGoodSD4350
May 199086.6FairSatisfactoryFairVery Good-4450

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Steel Girder/Beamlinear ft.855855000
Steel Protective Coatingsq. ft.8,4598,459000
Reinforced Concrete Decksq. ft.7,7637,763000
Wearing Surfacessq. ft.7,1657,165000
Reinforced Concrete Abutmentlinear ft.137137000
Steel Pileeach2424000
Reinforced Concrete Pier Caplinear ft.136136000
Movable Bearingeach1010000
Fixed Bearingeach1010000
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.359359000