J.Kahn writes:

If no instrument departure gradients are published in a departure
procedure, then the default gradient requirement applies, which is 200
ft/NM.

OK, thanks.

It looks like IFR departures from runway 26 in L35 aren't allowed at all, so I
suppose I'll have to depart from runway 8 in the future if I really want to
depart IFR. Odd that there's nothing for runway 26 since it leads right over
the lake.