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Bridge Statistics for Dow City, Iowa (IA)
Condition, Traffic, Stress, Structural Evaluation, Project Costs


  • National Bridge Inventory (NBI) Statistics
  • 11Number of bridges
  • 135ft / 41.5mTotal length
  • 9,865Total average daily traffic
  • 2,155Total average daily truck traffic
  • 9,865Total future (year 2041) average daily traffic
  • National Bridge Inventory (NBI) Registered Bridges for Dow City
  • No street view available for this location

New bridges in Dow City, IA - historical statistics
  • New bridges - historical statistics
  • 11920-1929
  • 21950-1959
  • 11960-1969
  • 11970-1979
  • 11980-1989
  • 41990-1999
  • 12020-2022
Reconstructed bridges in Dow City, IA - Historical Statistics
  • Reconstructed bridges - Historical Statistics
  • 11970-1979
  • 11980-1989
Bridge Condition - Deck
  • Bridge Condition - Deck
  • 42.9%Very good
  • 28.6%Good
  • 14.3%Satisfactory
  • 14.3%Fair
Bridge Condition - Superstructure
  • Bridge Condition - Superstructure
  • 57.1%Very good
  • 14.3%Good
  • 28.6%Satisfactory
Bridge Condition - Substructure
  • Bridge Condition - Substructure
  • 42.9%Very good
  • 28.6%Good
  • 28.6%Fair
Bridge Condition - Channel
  • Bridge Condition - Channel
  • 54.5%Good
  • 27.3%Satisfactory
  • 18.2%Fair
Bridge Condition - Culverts
  • Bridge Condition - Culverts
  • 50.0%Good
  • 50.0%Satisfactory
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Structure Number: 2124,  Location: 5.6 mi. N of IA 37 (Lat: 41.917064,  Lng: -95.532831),  Route carried "on" structure: US 30,  Year Built: 1965,  Status: Open,  Structure Length: 3.54m (11.61ft),  Average Daily Traffic: 2,870 (year 2020),  Truck Traffic: 24%,  Average Future Daily Traffic: 2,870 (year 2041),  Design Load: HS 20,  Features Intersected: FLASHER CREEK
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 70.066,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 9.1m (29.9ft),  Skew: 3 degrees,  Material/Design: Concrete continuous,  Design/Construction: Slab,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 13.7m (44.9ft),  Curb-To-Curb Width: 9.1m (29.9ft),  Out-to-Out Width: 11.0m (36.1ft)

Condition: Deck: Satisfactory,  Superstructure: Satisfactory,  Substructure: Good,  Channel: Good,  Operating Rating: 48.3 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 28.9 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Meets minimum limits,  Waterway Adequacy: Equal to present minimum criteria,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: July 2021,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Low Slump Concrete
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Structure Number: 21251,  Location: 0.2 mi. E of S.R. M14 (Lat: 41.932628,  Lng: -95.488850),  Route carried "on" structure: US 30,  Year Built: 1925,  Year Reconstructed: 1977,  Status: Open,  Structure Length: 0.73m (2.40ft),  Average Daily Traffic: 2,740 (year 2020),  Truck Traffic: 25%,  Average Future Daily Traffic: 2,740 (year 2041),  Design Load: H 20,  Features Intersected: SCATTER CREEK
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 74.107,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 13.4m (44.0ft),  Skew: 3 degrees,  Material/Design: Concrete continuous,  Design/Construction: Culvert,  Number Of Spans In Main Unit: 2,  Length of Maximum Span: 3.4m (11.2ft)

Condition: Channel: Satisfactory,  Culverts: Satisfactory,  Operating Rating: 30.8 metric tons,  Method Used To Determine Operating Rating: Field evaluation and documented engineering judgment,  Inventory Rating: 22.7 metric tons,  Method Used To Determine Inventory Rating: Field evaluation and documented engineering judgment,  Structural Evaluation: Equal to present minimum criteria,  Waterway Adequacy: Equal to present minimum criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: January 2021
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Structure Number: 2126,  Location: 0.8 mi. E of SR M14 (Lat: 41.936625,  Lng: -95.480469),  Route carried "on" structure: US 30,  Year Built: 1959,  Status: Open,  Structure Length: 9.91m (32.51ft),  Average Daily Traffic: 2,740 (year 2020),  Truck Traffic: 25%,  Average Future Daily Traffic: 2,740 (year 2041),  Design Load: HS 20,  Features Intersected: BOYER RIVER
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 74.936,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 13.4m (44.0ft),  Skew: 3 degrees,  Material/Design: Steel continuous,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 37.5m (123.0ft),  Curb-To-Curb Width: 9.2m (30.2ft),  Out-to-Out Width: 11.0m (36.1ft)

Condition: Deck: Fair,  Superstructure: Good,  Substructure: Fair,  Channel: Fair,  Operating Rating: 44.4 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 26.3 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Somewhat better than minimum adequacy,  Deck Geometry: Meets minimum limits,  Waterway Adequacy: Equal to present minimum criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Other Special Inspection Frequency: Every 24 months,  Inspection Date: August 2021,  Other Special Inspection Date: August 2020,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Low Slump Concrete
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Structure Number: 126891,  Location: 082400305 (Lat: 41.944375,  Lng: -95.498039),  Route carried "on" structure: County highway ,  Year Built: 1988,  Status: Open,  Structure Length: 4.33m (14.21ft),  Average Daily Traffic: 110 (year 2012),  Average Future Daily Traffic: 110 (year 2041),  Design Load: HS 20,  Features Intersected: PARADISE CREEK,  Facility Carried by Structure: LOCAL
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 3.534,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 9.1m (29.9ft),  Material/Design: Prestressed concrete,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 15.9m (52.2ft),  Curb-To-Curb Width: 7.3m (24.0ft),  Out-to-Out Width: 8.3m (27.2ft)

Condition: Deck: Very good,  Superstructure: Very good,  Substructure: Very good,  Channel: Good,  Operating Rating: 70.2 metric tons,  Method Used To Determine Operating Rating: Allowable Stress (AS),  Inventory Rating: 37.1 metric tons,  Method Used To Determine Inventory Rating: Allowable Stress (AS),  Structural Evaluation: Equal to present desirable criteria,  Deck Geometry: Somewhat better than minimum adequacy,  Waterway Adequacy: Better than present minimum criteria,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 126901,  Location: 082400606 (Lat: 41.937622,  Lng: -95.542267),  Route carried "on" structure: County highway ,  Year Built: 1992,  Status: Open,  Structure Length: 0.76m (2.49ft),  Average Daily Traffic: 50 (year 2016),  Average Future Daily Traffic: 50 (year 2041),  Design Load: HS 20,  Features Intersected: WELCH CREEK,  Facility Carried by Structure: FM
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 0.579,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 8.5m (27.9ft),  Skew: 1 degrees,  Material/Design: Concrete continuous,  Design/Construction: Culvert,  Number Of Spans In Main Unit: 2,  Length of Maximum Span: 3.7m (12.1ft),  Curb-To-Curb Width: 8.5m (27.9ft),  Out-to-Out Width: 8.5m (27.9ft)

Condition: Channel: Good,  Culverts: Good,  Operating Rating: 44.1 metric tons,  Method Used To Determine Operating Rating: Assigned rating based on Load Factor Design (LFD) reported in metric tons,  Inventory Rating: 32.7 metric tons,  Method Used To Determine Inventory Rating: Assigned rating based on Load Factor Design (LFD) reported in metric tons,  Structural Evaluation: Better than present minimum criteria,  Deck Geometry: Better than present minimum criteria,  Waterway Adequacy: Better than present minimum criteria,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021
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Structure Number: 126912,  Location: 082400704 (Lat: 41.932581,  Lng: -95.544939),  Route carried "on" structure: County highway ,  Year Built: 2020,  Status: Open,  Structure Length: 1.55m (5.09ft),  Average Daily Traffic: 35 (year 2012),  Average Future Daily Traffic: 35 (year 2041),  Features Intersected: WELCH CREEK,  Facility Carried by Structure: 165TH ST
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 0.977,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 7.3m (24.0ft),  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 1,  Length of Maximum Span: 15.5m (50.9ft),  Curb-To-Curb Width: 7.0m (23.0ft),  Out-to-Out Width: 7.0m (23.0ft)

Condition: Deck: Very good,  Superstructure: Very good,  Substructure: Good,  Channel: Good,  Operating Rating: 29.4 metric tons,  Method Used To Determine Operating Rating: Allowable Stress (AS),  Inventory Rating: 24.5 metric tons,  Method Used To Determine Inventory Rating: Allowable Stress (AS),  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Somewhat better than minimum adequacy,  Waterway Adequacy: Superior to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021,  Deck Structure Type: Wood or Timber,  Wearing Surface/Protective System: Wearing Surface: Wood or Timber
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Structure Number: 126921,  Location: 082400709 (Lat: 41.925258,  Lng: -95.543606),  Route carried "on" structure: County highway ,  Year Built: 1991,  Status: Open,  Structure Length: 0.88m (2.89ft),  Average Daily Traffic: 220 (year 2016),  Average Future Daily Traffic: 220 (year 2041),  Design Load: HS 20,  Features Intersected: WELCH CREEK,  Facility Carried by Structure: FM
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 4.253,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 11.0m (36.1ft),  Material/Design: Concrete continuous,  Design/Construction: Culvert,  Number Of Spans In Main Unit: 2,  Length of Maximum Span: 4.3m (14.1ft),  Curb-To-Curb Width: 11.0m (36.1ft),  Out-to-Out Width: 11.0m (36.1ft)

Condition: Channel: Good,  Culverts: Good,  Operating Rating: 44.1 metric tons,  Method Used To Determine Operating Rating: Assigned rating based on Load Factor Design (LFD) reported in metric tons,  Inventory Rating: 32.7 metric tons,  Method Used To Determine Inventory Rating: Assigned rating based on Load Factor Design (LFD) reported in metric tons,  Structural Evaluation: Better than present minimum criteria,  Deck Geometry: Equal to present desirable criteria,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021
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Structure Number: 126931,  Location: 082400803 (Lat: 41.924022,  Lng: -95.528286),  Route carried "on" structure: County highway ,  Year Built: 1994,  Status: Open,  Structure Length: 7.50m (24.61ft),  Average Daily Traffic: 250 (year 2016),  Truck Traffic: 22%,  Average Future Daily Traffic: 250 (year 2041),  Design Load: HS 20,  Features Intersected: BOYER RIVER,  Facility Carried by Structure: FM
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 5.567,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 9.4m (30.8ft),  Material/Design: Prestressed concrete,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 25.0m (82.0ft),  Curb-To-Curb Width: 9.3m (30.5ft),  Out-to-Out Width: 10.1m (33.1ft)

Condition: Deck: Very good,  Superstructure: Very good,  Substructure: Very good,  Channel: Good,  Operating Rating: 85.3 metric tons,  Method Used To Determine Operating Rating: Allowable Stress (AS),  Inventory Rating: 37.1 metric tons,  Method Used To Determine Inventory Rating: Allowable Stress (AS),  Structural Evaluation: Equal to present desirable criteria,  Deck Geometry: Equal to present minimum criteria,  Waterway Adequacy: Superior to present desirable criteria,  Approach Roadway Alignment: High priority of corrective action,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete,  Deck Protection: Epoxy Coated Reinforcing
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Structure Number: 126945,  Location: 000000000 (Lat: 41.928722,  Lng: -95.488933),  Route carried "on" structure: City street ,  Year Built: 1959,  Status: Open,  Structure Length: 0.76m (2.49ft),  Average Daily Traffic: 630 (year 2016),  Average Future Daily Traffic: 630 (year 2041),  Design Load: H 20,  Features Intersected: SMALL STREAM,  Facility Carried by Structure: FM
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 0.814,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 11.0m (36.1ft),  Skew: 1 degrees,  Material/Design: Concrete continuous,  Design/Construction: Culvert,  Number Of Spans In Main Unit: 2,  Length of Maximum Span: 3.0m (9.8ft),  Curb-To-Curb Width: 11.0m (36.1ft),  Out-to-Out Width: 11.0m (36.1ft)

Condition: Channel: Fair,  Culverts: Satisfactory,  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Better than present minimum criteria,  Waterway Adequacy: Equal to present minimum criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021
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Structure Number: 126951,  Location: 082401004 (Lat: 41.934447,  Lng: -95.493233),  Route carried "on" structure: County highway ,  Year Built: 1972,  Year Reconstructed: 1993,  Status: Open,  Structure Length: 10.03m (32.91ft),  Average Daily Traffic: 210 (year 2016),  Truck Traffic: 20%,  Average Future Daily Traffic: 210 (year 2041),  Design Load: H 20,  Features Intersected: BOYER RIVER,  Facility Carried by Structure: FM
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 0.232,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 11.0m (36.1ft),  Material/Design: Prestressed concrete,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 4,  Length of Maximum Span: 25.0m (82.0ft),  Curb-To-Curb Width: 9.1m (29.9ft),  Out-to-Out Width: 10.1m (33.1ft)

Condition: Deck: Good,  Superstructure: Very good,  Substructure: Very good,  Channel: Satisfactory,  Operating Rating: 77.2 metric tons,  Method Used To Determine Operating Rating: Allowable Stress (AS),  Inventory Rating: 32.7 metric tons,  Method Used To Determine Inventory Rating: Allowable Stress (AS),  Structural Evaluation: Equal to present desirable criteria,  Deck Geometry: Equal to present minimum criteria,  Waterway Adequacy: Better than present minimum criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: March 2021,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete,  Deck Protection: Epoxy Coated Reinforcing
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Structure Number: 128151,  Location: 083403203 (Lat: 41.964739,  Lng: -95.526161),  Route carried "on" structure: County highway ,  Year Built: 1999,  Status: Posted for load,  Structure Length: 1.49m (4.89ft),  Average Daily Traffic: 10 (year 2012),  Average Future Daily Traffic: 10 (year 2041),  Features Intersected: WELCH CREEK,  Facility Carried by Structure: LOCAL
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 9.325,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 7.3m (24.0ft),  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 1,  Length of Maximum Span: 14.3m (46.9ft),  Curb-To-Curb Width: 7.3m (24.0ft),  Out-to-Out Width: 7.3m (24.0ft)

Condition: Deck: Good,  Superstructure: Satisfactory,  Substructure: Fair,  Channel: Satisfactory,  Operating Rating: 25.9 metric tons,  Method Used To Determine Operating Rating: Allowable Stress (AS),  Inventory Rating: 19.0 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Somewhat better than minimum adequacy,  Deck Geometry: Equal to present minimum criteria,  Waterway Adequacy: Better than present minimum criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Bridge Posting: Required (Relationship of Operating Rating to Maximum Legal Load: 10.0 - 19.9% below),  Length Of Structure Improvement: 7.00m (22.97ft),  Designated Inspection Frequency: Every 24 months,  Inspection Date: April 2021,  Bridge Improvement Cost: $168,000,  Roadway Improvement Cost: $17,000,  Deck Structure Type: Wood or Timber,  Wearing Surface/Protective System: Wearing Surface: Wood or Timber
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