i have fished Holbrook a lot in the past, just not recently.
The west side boat ramp off 1799 is mid lake and you can drop your trolling motor and head north from there.
Most of the timber is down now but you should idle the north quarter of the lake.

There's only 2 public free ramps...one west and one south...we always go to west ramp ..it has bathrooms and a good ramp....and we go up north from there...Holbrook does not really have many stumps....haven't fish there this year yet ..there are always cattails along the bank to cast to and docks...and topwater bite has been good in the past to the right of the ramp were there are alot of cattails...CR2298

I was there Saturday, the restrooms at both county ramps are locked up. There is another ramp on the far north end like TxDan said and it will put you up on the best end of the lake for fishing in my opinion.

Depending on weather, there will be plenty of recreational boat traffic on the south end.

There's a long cove on the far northwest end of the lake that has a deep creek running through the middle, with with lots of timber. Might find yourself some "late bloomers" up in that area. Be sure to IDLE ONLY on the north end.

If you start off on the south end, it is wide open. You'll see some buoys mid-lake, be sure to IDLE ONLY north of them. The county ramp on the west side of the lake normally isn't as crowded as the main ramp on the east side.