T58 wetlands are comprised of Ramensk's sedge (T5) and a variety of grasses and forbs (T8). Two wetlands were mapped as T58.  At both, Ramensk's sedge dominates a heterogeneous environment where the diverse grass and forb plant community grows in segregated patches, as well as in mixed stands of nearly pure Ramensk's sedge at the base of a bluff.  One is located near the mouth of the Anchor River, the other near the Kasilof River mouth.

T5 is the tidal zone occupied by Ramensk's sedge, and corresponds with Vince and Snow's (1984) 'Outer Sedge Marsh Zone 3', estimated to be inundated on only the highest spring tides, or an average of 3 times per summer on the Susitna Flats (with a range of 0-5 times per summer), in upper Cook Inlet, Alaska.  Vince and Snow found that water was retained for 2-3 days per inundation. 

T8 is found on higher slopes above protected tidal flats, and corresponds to Vince and Snow's (1984) 'Riverbank Levees zone 6'.  Vince and Snow estimate that Riverbank Levees are inundated an average of once per summer (range 0-2 times for a duration of 2-3 hours), by the highest spring tides.