Wikipedia says Commonwealth was
based on Jack Trice Stadium (or Cyclone Stadium) in Ames Iowa, (Iowa State University). I am still looking for the place where I read Arrowhead was the inspiration, I am quite sure I have.
Commonwealth Stadium
City of Edmonton
In the early 1970s, a group of Edmonton sports enthusiasts organized a bid to host the 1978 Commonwealth Games. The group quickly secured significant federal, provincial and city support for the bid. The financial backing given to the bid committee was an important factor in Edmonton being granted the games, and key component of this support was a proposal to build or renovate a range of venues as a sports legacy for Edmonton.
Initially, there was some thought given to rebuilding Clarke Stadium to make it large enough to host the main track and field, and other sports events for the games. However, by late 1974, there was substantial agreement that a new larger stadium was the best option. There were some debates over the form that stadium might take and discussions around possible locations, but by January 1975, Edmonton City Council had settled on construction of a huge, over 40,000 person capacity, stadium adjacent to the old Clarke Stadium.
Construction of the new Commonwealth Stadium was a massive undertaking. This photograph, taken in August 1976 shows work on the excavations for the field level and the start of work on the recreation centre and field house at the south end of the stadium. In addition, Council approved construction of the Kinsmen Aquatic Centre for swimming and diving events, and the Argyll Velodrome for cycling, while badminton, wrestling and some other sports would be staged using University of Alberta sports facilities.
Despite considerable opposition from residents and community groups in the new stadium area, construction began on the new facility in March. Edmontonians were regularly informed by the news media about the scale, and cost, of the project. Construction required removal of 500,000 cubic yards of dirt for the stadium infield. This excavation work required 40 trucks, eight earth movers, backhoes, excavators, and other heavy equipment.
The construction was not without problems. There was a lot of interest in an extra bill of $50,000 for a special Royal Retirement Room adjacent to the Royal Box, and some questions were asked about the training and office space allocated to the Eskimos.
There was even a long and often heated debate about whether or not the stadium needed a roof or dome to make it impervious to the elements. The projected cost of $18.2 million (or more) for the roof limited public support for this idea. By early 1978, these issues seemed resolved, though there was some concern expressed by a few athletes about footing on the Pro Turf surface used for the track, and for some field events such as javelin and high jump. Otherwise, the stadium and other facilities were finished in good time, more or less on budget, and with minimal controversy.