The creek displayed an unusual shade of green after the rains stopped.
After a week of daily rainfall, the Rummel Drain, aka Rock Creek, which flows through the center of Cranbrook Village, appeared bright green on Sunday morning. I had never seen anything like it, since the county created a system of weirs several years ago. So I contacted the Oakland County Water Resources Commissioner’s Office, and they sent agents to investigate.
This morning I received a phone call with the answer to the riddle: The bright green color in the creek is algaecide. The agent said that golf courses use it in ponds, and since we’re downstream from at least one course, it probably originated from there. She assured me that the algaecide was safe (nontoxic) and environmentally friendly … except to algae.
