Although set on Orcas Island (the largest of Washington State's San Juan islands), the movie was actually filmed in and around Ucluelet, on the south coast of Vancouver Island (Canada).
Ronald Reagan is seen, on television, in the Bank, addressing the Nation on the weapons for hostages scandal concerning the Iran arms and Contra affair; this, then dates the timeline is this feature as November the 13th, 1986, at least.
The cans of oil that the girl is stacking at 1:37:23 are "1 Litre" cans (not pints), sold in Canada, not USA., revealing the true filming location.
Lou and Hannah cross a river over a partially hanging rope with wooden steps, when Lou, then Hannah, lose their footing and fall, sliding down the muddy embankment. Later, they walk up to the coast of the water and neither have any mud on their jeans, jackets, boots or hair despite Lou landing face down in it.