Beaver Bend above the dam water outlet is great for floating and swimming the Elm, Fern and Hickory camping areas on the map.
Beaver Bend MapBelow the powerhouse, the river alongside the Acorn and Buckeye camping areas (and Cypress) and the Cabin area are marked as 'No swimming' down to the low water dam (as of about 18 months ago my last visit) - but I've seen people in the water there in the past.
The two RV campgrounds at Hochatown SP are not located on the water. There is a big swim beach along the dispersed tent camping area. I've seen a few small TT/ popups dry camping in those sites in the past.
There are no other campgrounds on the lake.
Hochatown MapBroken Bow is a 'relatively' new lake - I remember visiting the year it was filling up - late 60s.
It is an incredibly beautiful area - and worth the visit. Even with no lakeside camping sites.
One recommendation - take a motorhome/ RV in via the north Route 259A access - not the south. Yes, it is a big downgrade to Big Bend from the top of the dam - but a wide road. The south road is also a steep downgrade - on a narrow curvy road with almost no shoulders.