The Ottawa National Forest page on Black River Harbor Recreation Area explains:
Known for its spectacular waterfalls, idyllic beaches, scenic hiking trails and tranquil campground, the Black River Harbor Recreation Area is a popular destination throughout the year. Originating in Wisconsin, the Black River flows through forested areas of large pine, hemlock and hardwood trees. The River has a series of scenic waterfalls as it drops in elevation to meet Lake Superior. Tannin (tannic acids) from hemlock trees is what gives it its unique color.
The Harbor offers one of the area’s few access points to Lake Superior, with boating being a major summer time activity. The boat ramp can accommodate almost any craft trailered in. There is no launching fee. Boat fuel and snacks are available through the concessionaire. Parking for trucks and boat trailers is ample.
Read on more more information including a map.
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