This solvable-on-site puzzle is located in Hoffman Park. The posted coordinates bring you to a wonderful area called the Tri-Angels Playground, a memorial to three sisters from River Falls. Check out the web if you'd like to read some additional background on how this playground came to be and how the community came together to create this tribute to the girls.
The coordinates bring you to the Tri-Angels sign (the largest one here). The FINAL coordinates are:
N44 51.878
W092 36.XXX
.....where XXX equals the year this playground was established minus 1372.
Cache is close by and should be accessible any time of year. This can be a high-muggle area, so use stealth as required. A black bison tube here, so please bring your own writing stick. And, bring the kids - this is a great place to explore