There are plenty of lodges/gamefarms in the area. Google something like "mokolo dam lodge" and you should come right. I don't think any of them have direct access to the dam though.
The gate only opens at 6 and we started fishing at 5 every day. They go mad for jerkbaits/poppers/cranks in low light conditions!
There is a lodge right across the entrance to the dam, but I can't remember the name of the place. I know "Leopard Lodge & The Cubs " is about 5km or so from the dam.