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We collaborate, we share knowledge, and we expect excellence.

Featured Projects

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Sonoran Boulevard: 15th Avenue to Cave Creek Road

Sonoran Boulevard: 15th Avenue to Cave Creek Road

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El Mirage Road: Northern Avenue to Cactus Road Design Services

El Mirage Road: Northern Avenue to Cactus Road Design Services

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Light Rail Transit: Gilbert Road Park-n-Ride Facility

Light Rail Transit: Gilbert Road Park-n-Ride Facility

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Rio Salado Pathway: 32nd Street Alignment to SR143/Hohokam Freeway

Rio Salado Pathway: 32nd Street Alignment to SR143/Hohokam Freeway

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Camelback Road Pedestrian Underpass

Camelback Road Pedestrian Underpass

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Luke Air Force Base Renovation of Building 976: Foreign Mission Sales Training Facility

Luke Air Force Base Renovation of Building 976: Foreign Mission Sales Training Facility

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SR303L: Waddell Road to Mountain View Boulevard

SR303L: Waddell Road to Mountain View Boulevard

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Pima Road Bridge at the Salt River Project Canal

Pima Road Bridge at the Salt River Project Canal

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Arizona Department of Transportation Bridge Inspection

Arizona Department of Transportation Bridge Inspection

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Ellsworth Channel Relocation

Ellsworth Channel Relocation

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Interstate 10 / Santan Freeway System Interchange

Interstate 10 / Santan Freeway System Interchange

Premier joined Olsson in March 2021, and now operates as Olsson & Premier. Together, we offer Olsson’s full spectrum of services.

Premier started as a home-based, one-man operation, and has grown into one of the most successful engineering firms in the Phoenix metropolitan area. We haven’t lost that personal connection and consider each client a member of our team and every project as another step toward progress.

We collaborate, we share knowledge, and we expect excellence. This hands-on approach by principals and project managers means that clients receive the very best of the team’s engineering skills. We have earned the respect of countless clients because of our passion, integrity, and responsiveness.

Associate Vice President

Chidambaram "CG" Gnanasambanthan

Chandler, Arizona

480.829.6000

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Associate Vice President

Fadi Jalaghi

Chandler, Arizona

480.980.3168

Get in Touch  
  Sonoran Boulevard: 15th Avenue to Cave Creek Road

Sonoran Boulevard: 15th Avenue to Cave Creek Road

Phoenix, Arizona

 

Owner & Client: City of Phoenix

The 6.89-mile Sonoran Boulevard project begins at 15th Avenue and ends at Cave Creek Road. The city selected Premier as the lead consultant to provide preliminary design services for the entire length of the project and final design services for the 2.42-mile central segment. This included designing three new precast, prestressed girder bridges that would comply with American Association of State Highway and Transportation Officials guidelines. Along the northern side of the roadway, Premier also designed a shared-use path that was more than 5 miles long and 10 feet wide. Ten wash-crossing bridges were designed as part of the shared-use path. Designing a new 69 kV line throughout most of the corridor involved extensive coordination with Arizona Public Service. In addition, conduits were placed for the city’s future Intelligent Transportation System requirements.

Premier’s preliminary evaluation of the proposed roadway profile in the East Sonoran Parkway Concept Report (prepared by others) resulted in lowering the proposed roadway profile by approximately 5 feet while still maintaining the desired goals of the project. Lowering the roadway profile significantly lessened the earthwork borrow needs and allowed for the elimination of one vehicular bridge. The bridge was replaced with a standard Arizona Department of Transportation box culvert, which resulted in significant project cost savings. Also, Premier’s approach in crossing one of the floodplains within the project limits significantly reduced the length of another bridge that was proposed in the concept report, thus providing additional savings to the owner.

Premier’s creative engineering solutions saved the city $20 million while still maintaining the overall project goals.

This project has received multiple awards including the American Public Works Association (APWA) 2014 National Transportation ($25 million – $75 million category) Project of the Year, the APWA 2014 Arizona Transportation ($25 million – $75 million category) Project of the Year, and the American Council of Engineering Companies (ACEC) 2013 Award of Merit and People’s Choice.

  El Mirage Road: Northern Avenue to Cactus Road Design Services

El Mirage Road: Northern Avenue to Cactus Road Design Services

El Mirage, Arizona

 

Owner & Client: City of El Mirage & Maricopa County Department of Transportation

Premier provided final design services for El Mirage Road from Northern Avenue to Cactus Road for Maricopa County Department of Transportation (MCDOT). This project included intersection improvements at Olive Avenue, Peoria Avenue, and Cactus Road. The roadway improvements for this 3-mile project included widening the existing road to a six-lane facility with a raised median. Services included collecting research/data; preparing as-built plans, horizontal/vertical control, right-of-way strip maps and utility map base files, legal descriptions, base maps, roadway plans, earthwork cross-sections, utility coordination, on- and off-site hydrology, a drainage report; and designing on-site storm system drainage.

El Mirage Road improvements were tied to the overall Northern Parkway improvements, that were still underway at the time by MCDOT. Several adjacent private parcels were developed before the current city development standards were approved and did not have space for an aboveground retention basin without significant impacts to their current facilities and operations. Premier’s solution was to design an underground retention system that met the city’s drainage requirements and avoided significant impacts to the existing development.

  Light Rail Transit: Gilbert Road Park-n-Ride Facility

Light Rail Transit: Gilbert Road Park-n-Ride Facility

Mesa, Arizona

 

Owner & Client: Valley Metro & Jacobs

As part of the Valley Metro Rail and the City of Mesa’s Gilbert Road Light Rail Extension project, Premier provided site civil design and structural site wall design services for the development of the park-n-ride (PNR) facility located at the southwestern corner of Main Street and Gilbert Road. The PNR work included a new asphalt concrete parking lot, related signing and marking, raised landscaped planters, site walls, concrete sidewalk, an operator building, site lighting, closed-circuit television (CCTV) security cameras, and related on-site utilities. This PNR facility provides parking for a minimum of 500 vehicles.

  Rio Salado Pathway: 32nd Street Alignment to SR143/Hohokam Freeway

Rio Salado Pathway: 32nd Street Alignment to SR143/Hohokam Freeway

Phoenix, Arizona

 

Owner & Client: City of Phoenix

Premier prepared the project assessment and final plans, specifications, and estimates for improvements to a 2.5-mile segment of the Rio Salado Pathway system along the Salt River. The multiuse pathway improvements included the design of a 12-foot-wide paved pathway along the top of the south bank of the Salt River with a portion of the pathway required to ramp into the Salt River floodway and pass below the existing bridge structures. When completed, this pathway segment and the adjoining segment in the neighboring City of Tempe will close a large gap in the overall pathway network and provide a unique experience that allows users to wend their way along the adjacent diverse Salt River ecosystem.

In order to maintain the design aesthetics and enhance user experience, the new pathway shared a portion of the Salt River’s existing floodway. To ensure the proposed improvements did not raise the high-water surface elevation of the Salt River, extensive analysis of the impacts to the river hydraulics were performed. To minimize those impacts, we recommended reducing the cross-section to 12.5 feet and combining that with a turned-down concrete edge for the pathway at the bridge crossings. This reduction in path width still met minimum American Association of State Highway and Transportation Officials guidelines and reduced overall construction costs related to the pathway foundation at the bridge crossings, which easily resulted in consensus from all key stakeholders.

  Camelback Road Pedestrian Underpass

Camelback Road Pedestrian Underpass

Phoenix, Arizona

 

Owner & Client: City of Phoenix

The City of Phoenix retained Premier to prepare a design concept report and an environmental determination report for this highly visible and complex project in the most prestigious business neighborhood in Phoenix. After providing a preliminary evaluation of alternatives, we recommended the underpass option with an aesthetically enhanced plaza at each entrance. The city then requested that Premier complete the final design of the recommended alternative.

The entire roadway segment from 24th Street to 26th Street was geometrically revised to design the underpass as a shallow crossing. The vertical profile of Camelback Road was raised by about 6 feet at the underpass location and matched to the existing grades just east and west of the 24th Street and 26th Street intersections, respectively. The horizontal alignment of the roadway was significantly changed to create additional plaza area on the south side of Camelback Road.

The complex structural design incorporated unique architectural and aesthetic features. Drainage design included analyzing off-site contributing runoff using HEC-1 and storm drain reconstruction in order to lower the existing storm drain to pass under the new pedestrian underpass. Utility relocation (including fiber optic duct banks) and construction sequencing in one of the busiest sections of Phoenix made the underpass design very challenging. Because of the project’s complexity, Premier conducted numerous design workshops and public meetings.

The Camelback Road Pedestrian Underpass project has won 13 local and national awards.

  Luke Air Force Base Renovation of Building 976: Foreign Mission Sales Training Facility

Luke Air Force Base Renovation of Building 976: Foreign Mission Sales Training Facility

Glendale, Arizona

 

Owner & Client: Luke Air Force Base

Premier provided design-build services for the renovation of Building 976 at Luke Air Force Base (LAFB). This facility will be used to conduct pilot training on the new F-35 Lightning II aircraft for Japanese and South Korean personnel under a Foreign Military Sales (FMS) case. Premier’s work for this project was completed as part of our multiple award construction contract with LAFB.

The major scope of work for this project was to perform a complete interior remodel and reconstruction of approximately 5,776 square feet of the existing facility. Because of the security sensitivity, SCIF/SAPF construction requirements were used for much of the southern portion of the construction. This included partial floor removal and replacement, full floor-to-ceiling structure walls with double layers of wallboard, acoustical treatment to sound transmission coefficient 45 Sound Group 3, access control system, and intrusion detection system. Within the nonsensitive areas, flooring modifications and wall construction were required to accommodate new offices for physical training. Premier also provided lighting, fire suppression, mechanical upgrades, and electrical modifications. Strong project management, meticulous quality control, and close collaboration with the government ensured on-time completion, commissioning, SCIF accreditation, and overall project success.

  SR303L: Waddell Road to Mountain View Boulevard

SR303L: Waddell Road to Mountain View Boulevard

Surprise, Arizona

 

Owner & Client: Arizona Department of Transportation

Premier developed the design from 30 percent to 100 percent plans, specifications, and estimates for Segment 6 of the SR303L (Estrella Freeway). This 3.5-mile segment begins on the southern end at Waddell Road and ends on the northern end at Mountain View Boulevard. The SR303L mainline consists of three general purpose (GP) lanes in each direction separated by an open median with cable barrier. The open median will accommodate the future construction of a concrete median barrier plus a new GP lane and a high-occupancy vehicle (HOV) lane in each direction. This project also includes two traffic service interchanges (TI) at Greenway Road and Bell Road. Both Greenway Road and Bell Road are classified as City of Surprise major arterial streets.

The Greenway Road crossroad improvements included horizontally realigning the roadway to the south and partially elevating the roadway as it crosses over the SR303L mainline. A new underpass bridge was constructed as part of the Greenway Road TI with SR303L. Greenway Road improvements included three through lanes in each direction, separated by a raised median, and dual left-turn lanes and single right-turn lanes at the TI. The Greenway Road TI is a compact diamond interchange. The Bell Road crossroad improvements, a new underpass bridge, and a new utility bridge were constructed as part of the STAN projects. This project included the TI ramps, traffic signals, and connections needed for the Bell Road TI to become fully functional as a traffic service interchange with SR303L. The Bell Road TI is a single point urban interchange (SPUI). The SR303L mainline is partially depressed under Greenway Road, fully depressed under Bell Road, returns to grade slightly north of Bell Road, and then continues at grade matching into the existing SR303L at Mountain View Boulevard. The northbound SR303L transitions from a three-lane freeway section to the existing one-lane roadway just south of Mountain View Boulevard. Similarly, the southbound SR303L transitions from the existing one-lane roadway to a three-lane freeway section.

In addition to the new two-span, cast-in-place, post-tensioned concrete box girder underpass bridge, Premier designed a concrete-lined open channel that was constructed along the west side of SR 303L and conveys the off-site and on-site freeway drainage to the south. This channel connects to the drainage system of the adjacent project at the southern end. Numerous channel transition structures, sound walls, and retaining walls were also required at various locations between Greenway Road and Mountain View Boulevard.

  Pima Road Bridge at the Salt River Project Canal

Pima Road Bridge at the Salt River Project Canal

Scottsdale, Arizona

 

Owner & Client: City of Scottsdale

Premier prepared construction documents for the widening of the three-span Pima Road Bridge over the Arizona Canal along the future northbound Pima Road alignment. The bridge had to be designed in four months and constructed before the roadway construction and during the Salt River Project (SRP) planned dry-up period. The project involved intense coordination with SRP and private utilities to relocate fiber optic and electrical lines to allow for the drilled shafts foundation construction. Approach roadway geometry was updated to allow for the future northbound roadway tie-in to the bridge. Premier led the design and coordination efforts with the construction manager, at risk contractor, and other stakeholders with a common goal of completing the substructure construction during the one-month canal dry up.

Because the bridge had to be designed in four months and then constructed during the SRP 30-day dry-up period, our team held biweekly coordination meetings with the multiple agency stakeholders, SRP, and private utilities to present and to resolve design issues in a timely manner. We prepared exhibits for the city and all stakeholders to review. These exhibits showed the proposed bridge and future roadway improvements and illustrated impacts to the right-of-way, canal access roads, and utilities that are in conflict. This resulted in consensus and the ability to provide utility relocation design for the private fiber optic lines and the SRP overhead and underground power lines. We were also able to obtain all the necessary clearances and permits before finalizing the plans, and we avoided potential redesign while still maintaining the project schedule.

  Arizona Department of Transportation Bridge Inspection

Arizona Department of Transportation Bridge Inspection

Statewide, Arizona

 

Owner & Client: Arizona Department of Transportation

The Arizona Department of Transportation (ADOT) awarded Premier four consecutive on-call bridge inspection contracts to complete safety, in-depth, and fracture-critical inspections of approximately 3,300 bridges over the length of the contract. The bridges are located in the metropolitan Phoenix area and statewide. These bridges were inspected in accordance with ADOT and Federal Highway Administration (FHWA) requirements. Fracture-critical and in-depth inspections were hands-on inspections of bridge elements including visual inspections of fatigue-prone details, visual and nondestructive tests (NDT) inspections of fracture-critical pin and hanger assemblies. Our inspection team verified inventory items and determined National Bridge Inspection (NBI) and element-level condition ratings and appraisal ratings. Important observations were photographed for documentation. Underbridge inspections were conducted by climbing ropes or by using snooper trucks or bucket trucks. Premier’s responsibilities also included coordination with ADOT’s maintenance district, railroad, and Department of Public Safety, and traffic control personnel.

  Ellsworth Channel Relocation

Ellsworth Channel Relocation

Mesa, Arizona

 

Owner & Client: Phoenix-Mesa Gateway Airport Authority

The purpose of the Ellsworth Channel Relocation project was to provide additional acreage for the development of the new east side Phoenix-Mesa Gateway Airport Authority (PMGAA) terminal and to maximize development opportunities for the parcel. The project included final design for relocating an approximately 6,000-foot reach of Ellsworth Channel to the airport property boundary with a relocated channel length of approximately 3,000 feet. The project also included relocating the confluence of Ellsworth Channel with Powerline Floodway approximately 3,000 feet upstream and improving Powerline Floodway between the existing confluence and the new tie-in point.

Premier provided several services for this project, including project management; hydrologic and hydraulic engineering; civil, structural, and geotechnical engineering; surveying and mapping; landscape design; and permitting. We also provided extensive stakeholder coordination with the PMGAA, the City of Mesa, the Flood Control District of Maricopa County (FCDMC), and the National Resources Conservation Service.

Additionally, we completed final design for approximately 900 feet of Hawes Road, including intersection improvements at Ray Road; a 70-foot, simple-span vehicular bridge crossing the channel; roadway improvements; and utility extensions to provide a new connection that would serve as the future main entrance into the airport. This project required extensive coordination with city staff, PMGAA, FCDMC, and various utility companies.

  Interstate 10 / Santan Freeway System Interchange

Interstate 10 / Santan Freeway System Interchange

 

Owner & Client: Arizona Department of Transportation & WSP, USA

Premier provided engineering services for part of this three-level system-to-system flyover interchange that connects existing Interstate 10 (I-10) to the Santan Freeway (Loop 202). Premier also prepared the plans, specifications, and estimates for a curved directional ramp. The eight-span structure is approximately 950 feet long and carries northbound I-10 traffic to westbound Loop 202. This cast-in-place, post-tensioned concrete box girder bridge was designed as a two-frame hinge system and has an out-to-out width of 31 feet, 2 inches. The abutments and piers are supported on spread footings.

Premier was also responsible for the off-site drainage design, which included hydrologic analyses, storm drain design, and channel design.