The Iowa River Pedestrian Bridge over the Iowa Dam, Coralville, IA

2006 ACEC Outstanding Civil Engineering Project Achievement

The Iowa River Pedestrian Bridge is a customized, pre-engineered structure which includes decorative railings and lookouts.  The bridge is 750’ long and is built right over a low-head dam.  Recently completed the total costs of the bridge was $1,800,000 with aesthetic improvements comprising $300,000.00.
NNW, Inc. was the structural engineer.  RDG Planning and Design and Neumann Monson Architects provided the aesthetic design.

The Iowa River Gazebo, Coralville, IA

2006 ACEC Outstanding Civil Engineering Project Achievement

The Iowa River Gazebo is a trailhead on the Johnson County trail and is the Coralville landing on the Iowa River Pedestrian Bridge. 
NNW, Inc. was the structural engineer.  RDG Planning and Design provided the aesthetic/ landscape design.

Hale Bridge
Jones County, Iowa

1877-1879

Manufactured by
King Iron Bridge and Manufacturing Co., Cleveland, OH

Three spans, 81’, 82’ and 100’.

Featured in the History Channel’s Mega Movers program June 27, 2006

NNW was hired by the Jones County Historic Preservation Committee to develop a preliminary cost estimate, prepare plans, perform hydraulic calculations and obtain permits for relocation of the Hale Bridge to a location of the Wapsipinicon River at Wapsipinicon State Park near Anamosa.  NNW was responsible for preparing restoration plans for the bridge and designing the bridge abutments, piers and approaches to enable its use for pedestrian traffic.  The restoration plans included: keeping the three (3) spans in the final location, ensuring the bridge would be kept historically correct, and maintaining eligibility for the National Register of Historic Places.  Plans were also developed to stabilize and reinforce the bridge for transport by air to its permanent location.  Since the bridge is wrought iron and not steel, the repair plans called for welding techniques requiring special care to prevent damage to the structure.  Additionally, NNW itemized restoration plan components to enable in/kind donations from interested parties in the restoration process. 

First Avenue Overpass

35 m single span railroad bridge over a four lane roadway.

2004 ACEC Engineering Excellence Grand Conceptor Award

ASCE 2003 Outstanding Civil Engineering Project Achievement Award

This unique structure consists of a composite steel box girder.  The depth of the structure was limited to 2.0 m  by the railroad grade above and the roadway grade below.  The steel box met the deflection requirements while providing a redundant load path.  Special detailing was required for aesthetic treatments on the bridge.

Woolf Avenue Bridge over U.S. Highway 6 and Crandic Railroad in Iowa City.

Replacement of
4 span 15m x 62m
 concrete slab bridge

US Highway 6 is the main arterial between the bustling commercial town of Coralville and the thriving college town of Iowa City.  Highway 6 usually sees in excess of 20,000 vehicles per day, with that count increasing considerably during football season.  Parallel to Highway 6, directly to the North is the Crandic Railroad, both running below the Woolf Avenue Bridge.  The existing bridge had expended its design fatigue life and had deteriorated to a point that it was posted for loads, concrete began falling onto the highway below and the bridge had twice been closed due to clearance issues.  Facing the need for a new bridge, the City desired to replace the old bridge with one that would not only solve the clearance problem but improve the appearance to this gateway into the City as well. The result was this award winning bridge with the words IOWA CITY engraved on either side.

2001 ACI, IA- MN Chapter Concrete Bridge Award
ASCE- IA Chapter Project Of The Year  CEC Of Iowa Grand Conceptor Award
1999 Iowa Quality Initiative Award For Best Slab Bridge In Iowa

Summit Street Bridge

New 165’ long, 43’ wide, 3-span steel frame bridge

Its love of the arts and appreciation and preservation of the “old” make the Summit street neighborhood very unique.  Adding to its intrigue and charm is the Summit Street Gallery half a block away.

This bridge is an inclined leg steel frame, which allowed for a thinner structure thus reducing the impact on the approach roadways.  The frame was made up of rolled steel beams, which reduced steel fabrication labor cost.  In the center of the bridge are “bump-outs” and in the sidewalk benches for people to watch the train switch-yard nearby, a design idea that was born of the residents themselves.

The finished product was the design of new 165-foot long, 43-foot wide, 3-span steel frame bridge. Project included 987 feet of urban approach roadway with storm sewer and utility relocation.

2000 Iowa Quality Initiative award for best steel beam bridge in the state of Iowa.  Steven K. Jacobsen was recognized as the designer

2000 Iowa Ready Mix Association Excellence in Concrete Award

Custom design of 4-span 40 foot x 320 foot skewed prestressed
concrete beam bridge.