Unwanted visitor

I discovered trespasser on the property in form of Northern Pocket Gopher.  I started to burrow  around some tree and brushes, I since I planted some apple trees last year and this year, I did not wanted to take chances that they may die as a result of the activity.  I decided to place special trap to try to get it.  First attempt did not work as it continue to dig more mounds and many holes appeared around the trees.  I could not determine which corridor was primary one and after investigating (flattening all the mounds) I discovered one that was rebuilt next morning.  I set the trap and nothing was cut in it.  It was time for the next step, flooding.  Got my garden hose and my trusty German shepherd to assist me in case it will come out suddenly, we embarked on eviction via flood.  I stuck the garden hose into the corridor that looked fresh and about 4' of hose went into it (I did attempt into multiple holes before that) around the water for about 20 minutes and ... finally give up  and walked away, but not before setting trap on that corridor.
This morning wanted to check if there was any activity in the area, so went to check and it seem like nothing has happened, until I looked at the trap and yes, in it was culprit.  Sad but unfortunately, that is what happens to trespassers (unwanted).  I am happy as the new tress were in real danger due to proximity to burrows.  I hope this was the only one (in general they are solitary like moles), but will monitor the situation.  Last year my neighbor has real infestation and he trapped eight of these creatures.