The photo is from a different site.

Old Car City Alaska Style - Exploring Nature by Sheila Newenham

From the 1950s through the 1970s, cars were just dumped here. The state of Alaska blames this on the era of federal ownership. The Electric Company bought the land in the 1980s, and since then, better surveillance and more people around seem to have stopped the dumping.

The speculation is that this secluded spot simply had easy road access for dumping cars. Some were deserted by their legitimate owners (demolition derbies used to take place nearby), others were stolen and ditched after a joyride, and still, others were set afire when they got stuck. To this day, abandoned cars sit along roadways throughout Alaska. It seems commonplace to just leave your broken-down car where it stopped and figure out a new transportation plan later.