If there are tell-tale signs on the surface, you can pitch to likely areas. Some of these would be bed-shaped holes in the grass. Your best bet is where these meet up with some kind of hardwood or rock. You will want to find some of the hardest ground around these areas.
You can also fish fast in matted grasses or overhangs with a frog or other similar 'search bait'. When you see the activity below (movement in the grass, boiling in the surface) pick that area apart as if you could see the fish on the bed.
2015 Skeeter FX 21
...and down goes PhotoBucket with the new Terms of Service... I predict they will be out of business or begging for forgiveness inside a month. 6/30/2017