Making a high resolution grid for a small area

[skuchta]

I'm struggling with some code. I'd like to make a grid of resolution 16, like this:

filename <- dgearthgrid(dgconstruct(res=16, projection = "ISEA", aperture = 4, topology = "TRIANGLE"),savegrid = "world_triangle_res16.shp")

The problem is that it is too big and crashes either R or my computer (and I've tried on several computers). I only need this grid for the Great Lakes region, not the entire earth. How do I infer this grid for a relatively small area? I've worked through the vignette and other online material, but the answer still escapes me. Thank you!