Yes, on the classification rather than on a thermometer. WDNR has stocked brown trout into Lyndon Creek across 4 recorded plants, between 2016 and 2019, and this site reads the water as cool from WDNR's management tier for it, which is an inference from how the fishery is managed and not a temperature WDNR publishes — but no USGS gauge on this river reports water temperature, so this site has no measured July mean to hold against the 54–66 °F band this fish wants. That is a stocking record and not a survey: it says WDNR put the fish in, not that anyone has since found one holding over. Fish of 8–16 inches are what Wisconsin reports as typical.
Introduced in the 1880s and now the fish most driftless spring creeks are managed for, reproducing without help across most of that footprint.
No USGS gauge on this river reports water temperature, so there is no measured July mean to put beside the species' band. WDNR publishes no temperature classification for this water; the Cool band above is inferred from its management tier for the fishery, and it is not a thermometer.
Wisconsin DNR classifies this water as Class III. The management tier on those reaches is stocked. This is a designation of the fishery and not the season and creel rules.
WDNR trout stream classification → Wisconsin season and creel rules →
The insects recorded from this river's region, earliest first. The full calendar →
Lyndon Creek — live water temperature, regulations and access