Just thought I'd move this over here, along with the additions that were suggested.
Known Facts
The girls were on the bridge
BG was on the bridge
The girls were dropped off on the north side of the creek/trail
The bodies were found on the north side of the creek
They were found about 50' from the creek south of the cemetery
The girls were dropped off by LG's sister by 1:45 (I'm not sure if the 1:45 time has been confirmed)
DG tried to reach them around 3:00 without any luck
Other people were on the trail and bridge close to that time period
There is a video (and we have stills from it) of the "main" suspect
There is a recording of the suspect's voice
There is a sketch of the suspect which is a composite of information from witnesses
The bodies were found on RL's property
RL is not a suspect
Libby was taking pictures
There was no school that day
The weather that day was seasonally mild
Within walking distance of the crime scene, there is a meat packing plant, a quarry, a recycling station, several homes (some empty, some not), a few roads (from gravel to highways)
Both girls died
The photos and video stills show they were on the south end of the bridge at one point
They crossed the creek twice one way or another
There were some footprints that led to the bodies.
Libby's phone was recovered
The crime scene was taped off
Nothing other than the entrance to the bridge was taped off on the south side of the creek (possibly a small area surrounding the entrance to the bridge)
RLs property, house, outbuildings, white truck were searched
Property across from RLs house where grain bin is located also searched
Creek flow was 70% above normal