Simpson Ponds:
I-25 north to Highway 402 (just north of Johnson's Corner), go west appr. 1.5 -2 miles. turn north on the first County Road you come to, pass over the Big Thompson River (not marked) and the ponds are on your left (west side ) side of the road. There are 2 parking areas, one on each side of the concrete plant.
The ponds all have fish, some are QUITE a challenge due to weed growth, but all have decent fish. Just this fall I caught a 4 1/2 lb. largemouth in the most southeast pond ( a little suspending jerk-bait ).
Big Thompson Ponds:
Lots of Crappie ( TINY...TINY...TINY ), but a kick to catch. You also can catch other panfish in the ponds there, but CATS are the target fish here. Cutbait is the way to go, just catch a fish, put a circle hook in him, and right back in he goes!
Good Luck and PM me if ya to know anything else or tag along some day ..... TONY