Have you tried gopher execution by road flair? It works if you find the main tunnel...
If the gopher holes are roughly in a line, the main tunnel is parrallel. Hammer a stake in several spots until you break through, then widen the hole--like a manhole above a sewer system. Light a flair, throw it in and cover the hole with a rock. Look around to see if there is smoke escaping anywhere and plug those spots too.
It a big PITA, but not as big a PITA as building underground cages.
OH I HATE GOPHERS!
If the gopher holes are roughly in a line, the main tunnel is parrallel. Hammer a stake in several spots until you break through, then widen the hole--like a manhole above a sewer system. Light a flair, throw it in and cover the hole with a rock. Look around to see if there is smoke escaping anywhere and plug those spots too.
It a big PITA, but not as big a PITA as building underground cages.
OH I HATE GOPHERS!