I honestly don't know for sure. It would be something you'd have to check with your DNR about. Make sure you mention them by their common and scientific name when you speak to the DNR. Many fisheries biologists are not familiar with them. Vegetated backwaters of larger rivers usually have decent grass shrimp populations so that would be a good start...
From another post: Glass Shrimp had the highest abundance at main channel border wing dikes(high visibility and low water velocity) and the lowest abundance in side channels. Pigg and Cheper (1998) and Page (1985) reported capturing high abundances of Glass Shrimp in areas with shallow water and low velocity. We hypothesize that Glass Shrimp inhabit wing dike scours to use the crevice habitat for hiding and/or feeding. In addition, Glass Shrimp feed on dead plant and/or animal material (Page, 1985), which is likely found in the scours when they are functioning as sediment sinks during normal to low river elevations. We found a negative correlation between Glass Shrimp abundance and depth of gear deployment, indicating that this shrimp was more abundant in shallower water in the unimpounded UMR. Glass Shrimp also were most abundant when river elevation was lower. Lower elevations occur during the summer months (e.g., sampling period 2) when water temperatures are warmer, which promotes fecundity (Hobbs, 2001). We also found that Glass Shrimp abundance was lowest in the side channels when compared to the other physical habitats. Closed side channels have low water velocity and high visibility, which are characteristic conditions for this species (Page, 1985; Barko and Herzog, 2003). Hence, the low abundance of Glass Shrimp in closed side channels was puzzling. Barko and Herzog(2003) reported high abundances of Centrarchidae in closed side channels, such as Orangespotted Sunfish (Lepomis humilis), Bluegill (L. macrochirus) and Green Sunfish (L. cyanellus). Based on the findings of Creaser (1932), we conclude that Glass Shrimp use this habitat but abundance remains low because of fish predation. Creaser (1932) reported high abundances of Glass Shrimp in pools with low fish abundance.
Some of your local lakes may also contain them... Running a dip net into vegetated areas would probably be the best method to capture them. A 1/8th inch mesh on the net would probably be a good size... I catch grass shrimp while running seines through sparsely vegetated areas on occasion as well.
