It then parallels Route 9 to its south until it joins the East Brookfield River between Lake Lashaway and Quaboag Pond.

The Seven Mile River drains Spencer and surrounding communities.

They remain as evidence of a forgone era when Spencer was a major manufacturing center.

In addition to small local brooks and streams, the Seven Mile River is fed from Turkey Hill Brook north of town and Cranberry River to the south.

At the head of Turkey Hill Brook, a major tributary to the Seven Mile River is Sugden Reservoir.