N12 over STREAM


+42.60029, -96.76999
42°36'01" N, 96°46'12" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.


Name:N12 over STREAM
Structure number:S012 22928
Location:JCT N9/N12 5.9NW
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Rural) [06]
Length of largest span:9.8 ft. [3.0 m]
Total length:30.8 ft. [9.4 m]
Owner:State Highway Agency [01]
Year built:1994
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:Concrete [1]
Main spans design:Culvert [19]
Deck type:Not applicable [N]

Latest Available Inspection: September 2014 

Status:Open, no restriction [A]
Average daily traffic:1,340 [as of 2012]
Truck traffic:9% of total traffic
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Bank and embankment protection is severely undermined. River control devices have severe damage. Large deposits of debris are in the channel. [4]
Pier/abutment protection:Navigation protection not required [1]
Culvert condition:Moderate to major deterioration or disintegration, extensive cracking and leaching or spalls on concrete or masonry walls and slabs. Minor settlement or misalignment. Noticeable scouring or erosion at curtain walls, wingwalls or pipes. Metal culverts have significant distortion and deflection in one section, significant corrosion or deep pitting. [5]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:46.9 tons [42.6 metric tons]
Inventory rating:36.0 tons [32.7 metric tons]
Sufficiency rating:81.3

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
September 201481.3Not deficient---1340
September 201273.9Not deficient---1505
September 201087.0Not deficient---1235
September 200887.0Not deficient---1235
September 200699.6Not deficient---1340
March 200499.7Not deficient---1250
August 200299.7Not deficient---1255
February 200099.7Not deficient---1120
March 199899.7Not deficient---1120
March 199697.7Not deficient---1060
April 199497.7Not deficient---1030
March 199237.4Functionally obsoleteFairFairFair910
February 199054.6Not deficientFairSatisfactorySatisfactory910