DULUTH – In some ways, Todd Carlson was like a detective who cracked thousands of cases involving crimes against the city's lakes, rivers and streams.
Sometimes erosion was the culprit, filling up the beds where the trout like to spawn. Other times washed-away road salt ratcheted up chloride levels, a potential danger to aquatic life. Particularly bad storms even caused untreated wastewater to overflow the sewage system and run into creeks.
"I always tell people one of the tricks is: Follow your nose," said Carlson, who retired last week after 21 years working for the city of Duluth, most of which were spent as program coordinator in the municipality's engineering department.
His favorite part of the job — which he called "the best career in the world" — wasn't being the environmental Sherlock Holmes. Carlson enjoyed helping educate the public about pollution and drainage even more.
"In a city as large as ours, with as many creeks and streams as we have, if we don't have the public's eyes out there looking, we can't see everything," Carlson said.
The 55-year-old grew up on the east side of Duluth and spent many of his childhood summers exploring the outdoors. For two years as a young adult he led Boy Scout trips to the Boundary Waters and Quetico Provincial Park in Canada. Then he spent 15 years as an assistant golf course superintendent at Northland Country Club.
Carlson joined the city in 1999, after a neighbor told him it was a great place to work. He started out working as a maintenance worker, using machinery to clean out sewers, dig pipes and make repairs to the system.
Starting in 2003, cities were required to follow new stormwater regulations that prohibited the discharge of pollutants into U.S. waters. Duluth was fined and ordered by federal officials to stop millions of gallons of sewage from seeping into Lake Superior and the St. Louis River during heavy rains.