There are a lot of things that are bad even though you can't tell by looking at them.
People, for example. Novels. And ice.
For example, the ice surrounding the mainland ice caves at the Apostle Islands National Lakeshore is abysmal.
In fact, it's so irredeemably bad the only hope for opening the ice caves this year (they last opened in 2015) is if a northeasterly wind blows it all out "to sea"? "to lake"? and new ice can form.
Bad ice is dangerous ice.