East River Drive Barrier Rail and Wall Project, Davenport, Iowa

2007 ACEC Iowa Engineering Achievement Award

Originally constructed in 1934, the East River Drive retaining wall and barrier rail project began as a 380-foot reinforced concrete section built as part of the realignment and widening of what is now known as US 67. 

This project included removal of approximately 2000 feet of limestone and concrete barrier rail and replacement with reinforced concrete barrier rail and reinforced paved shoulder along East River Drive (US Hwy 67) in the City of Davenport, Iowa. This project also included:  88,200 Lbs. of epoxy coated reinforcing steel, reconstruction of intake top, 2.2 stations of pavement markings and 6 squares of sod.  Traffic was maintained on East River Dr. on at least one lane northbound and two lanes southbound during construction.

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.

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.

2001 ACI, IA-MN Chapter, Concrete Bridge Award

2001 ASCE-IA Chapter Project of the Year Award

2001 CEC of Iowa Grand Conceptor Award

1999 Iowa Quality Initiative Award for Best Slab Bridge in Iowa

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 15m x 62m concrete slab bridge with the words IOWA CITY engraved on either side.

Summit Street Bridge

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

2000 Iowa Quality Initiative Award for Best Slab Bridge in the State of Iowa- Steve Jacobsen, PE was recognized as the designer.

2000 Iowa Ready Mix Association Excellence in Concrete Award

Its love of the arts and appreciation and preservation of the “old” make the Summit street neighborhood very unique. The Summit Street bridge was designed to fit in with the charm of this unique neighborhood.

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.

Lake MacBride Causeway Bridge, Johnson County

2000-2001 Iowa Quality Initiative Award for Superior Quality Workmanship

The existing bridge was two-span 80’ long x 24’ wide consisting of steel stringers on concrete pier and stub abutments.  The bridge had concrete deck and steel railings

The new design included partial removal of the existing bridge whereby portions were preserved and incorporated into the new structure.  The existing abutments remained in place and served as deadmen for the new abutments.  The existing pier also remained and a new cap was installed on it. 

Riverside Drive / Arts Campus, Iowa City, Iowa

2004 ACEC Engineering Excellence Honor Award

2000 Iowa Quality Initiative Award for Best Cast In Place Culbert in Iowa

This project included 13,000 square yards of pavement removal and replacement over .75 miles of residential roadway.  Significant staging of construction activity was required to facilitate access to streets without outlet and private residences.  This project also included major water main, sanitary sewer and storm sewer utility replacement.  The original sanitary sewer was extremely deep so a parallel sewer system was installed between manholes.  This project upgraded the entire infrastructure while maintaining the integrity and atmosphere of this established neighborhood.

West Burlington Avenue Bridge

1996 Iowa Quality Initiative Award for Best Steel Beam Bridge in Iowa

1996 Consulting Engineers Council of Iowa Honor Award

The City of Burlington and the Burlington Northern Railroad desired to replace a seventy-five year old pony truss carrying West Burlington Avenue over the Burlington Northern Railroad.  The bridge carries 1800 vehicles per day of which eight percent are trucks over a railroad that sees 32 trains per day.

The project included a 170’x40’ steel frame bridge over the railroad and 1200 feet of approach roadway with storm sewer and small retaining walls in a congested urban area.

This facility provides a north-south link for the City as well as truck access to the Burlington Northern Railroad maintenance facility.

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.