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Photo#241944
Nursery Web Spider - Pisaurina mira

Nursery Web Spider - Pisaurina mira
Heritage Valley, NE of Decorah, Allamakee County, Iowa, USA
August 24, 2008
Size: ~3"
Among rocks and xerophytic mosses in partial shade of eastern red cedars at edge of dry, rocky, native prairie. Extreme northeast Iowa. Tentative ID of genus Dolomedes.

looks like Pisaurina
species, one of the nursery web spiders, in the same family as Dolomedes. It could be P. mira, but you should check to see if P. undulata is found in your area too.

 
Close-ups of eyes
I zoomed in on the eyes and rotated the photo into "face" view. [Total of 3 progressive zoomed photos.] Resolution gets grainy at this scale, but hopefully this will help with ID. I see the four upper eyes, but only two lower eyes clearly. However, there might be two outer eyes on the lower row, represented by partial dark spots that are obscured by hairs (and not optimally seen by this vertical view); they appear to form a roughly horizontal line with the middle two (or are my "eyes" playing tricks on me?). If so, that would confirm the Pisaurina ID (Dolomodes arc upward). Some other photos of P. mira on BugGuide show that lower eyes appear to be horizontal (actually subtly downturned) with outer two partially hidden with "eyebrows":

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