Despite being close to Brookings this park is quiet and i didnt find it very full. Nice place to go camping, especially if you are looking to go birding for waterfowl or fishing one of the nearby lakes.
I stayed at twin bridges this past weekend with my wife and our two dogs. Despite nice weather it was less than half full. There aee three distinct areas to camp. One on the east side of HW 137, one on the west side of HW 137, and one south of HW 60. The area south of HW 60 is camper pads and very busy as it is right at the boat ramp. This area also charges a premium rate for its location ($27 with water and electric hook ups). The west side of HW 137 has lake huts ($50-$60ish per night) as well as tent and RV sites. The east side of HW 137 has tent and RV sites as well as the visitor center. Tent sites are $14, with electric $18, and electric and water for $22. You can reserve RV sites online but not tent sites. This area is mostly for RVs. The tent sides are all on a hill side so you cant find flat sites to tent camp and tent camping is poorly marked. We did find an "unimproved camping area" presumably for tent camping but everyone with an RV at the nearby RV sites used it as boat trailer parking. There are bathhouse on each side of HW 137 and we found them to be pretty good for a campground. There is a RV dump station behind the visitor center ($5 to dump, free to camping guests, payable at visitor center or envelope station). If you get in late there are signs instructing you to pay at visitor center the next morning. However these must be old signs as there is an envelope station in front of the visitor center door to register and pay (didnt seem like the visitor center is open much). Noticed a lot of trash around camping area into the wooded area around it. Not a lot to do in the park but plenty of fish and boating areas nearby. Also there are camp grills at each RV/camp spot but no fire pits, although we did notice people have just built camp fires as they see fit (not sure of park policy on this). Overall its a decent enough campground if you are going to be spending all your time on the lake but wouldnt recommend for tent camping or longer RV stays if you are looking for hiking trails and more secluded relaxation.