There is a link to a map via the link provided on Campendium to Holland Lake's official website...

The link on this page will give you information that helps. It has been several years since we camped there, but we LOVED it.

maps are available on the Flathead National Forest site The Bay Loop sites are a bit larger. And most sites are spaced out enough to give you reasonable privacy. The camp won't open until mid May as the bathrooms having running water, not pit toilets, so they need to wait until the risk of freezing pipes is minimal.