Today's Vancouver Sun has an article about the demise of AM radio in BC. (Note: The article mentions Typhoon Freda 1962 - for the Americans that would be the well-documented "Columbus Day Storm".)
AM radio stations across Canada have been knocked around like bumper cars by new technological changes
vancouversun.com
"CKNW was the only station north of California to remain on the air thanks to an emergency battery backup system. It became an emergency coordination and information centre, telling people what they needed to know."
It is incredible to think about how many AM radio stations have left the airwaves in Vancouver. AM stations do get shut down periodically in the US, but what we've seen in Vancouver over the past few years is pretty incredible. Here's a basic breakdown of what is left:
550 KARI (a border blaster airing religious content)
600 CKSP (Punjabi)
650 CISL (Sports)
690 CBU-AM (CBC Radio One)
730 CKNW (or CKNW after 980 shuts off officially)
1070 CFAX (Victoria station, but I'll count it)
1130 CKWX (All News)
1200 CJRJ (Punjabi)
1320 CHMB (Primarily Cantonese)
1470 CJVB (Mandarin and Cantonese)
1550 KRPI (a border blaster airing Punjabi)
1600 KVRI (a border blaster airing Punjabi)
Overall, the AM dial is getting increasingly sparse. And interestingly, there are many parts of the region that receive little to no FM reception at all. There are many highways out on Vancouver Island where no FM stations can be heard, but stations like 690, 730, and 1130 all come in clear. The Sea to Sky Highway is also a complete FM dead zone for Vancouver FM.
The unique terrain of the region seems to make radio complicated. Mount Seymour seems like a great FM site overall. It's far more accessible than many sites of a similar height (Tiger Mountain in Seattle comes to mind), but the geography isn't ideal. I think CBC probably would like to decomission 690 at some point, but I am not sure they can, as there's plenty of listeners who probably can't hear 88.1.