Dragonflies at the swamp

Dragonfly with brown and white spots on all four wings
My best guess: Twelve-spottedSkimmer aka Libellula pulchella (scientific name)
(Photo taken September 18, 2012 in George Bush Park near Kelliwood Lakes neighborhood)

Profile view of 12-spotted skimmer dragonfly on a twig

Dragonfly habitat - mating and egg-laying grounds in swampy spot
on the edge of wooded area in Barker Reservoir - there were numerous pairs of dragonflies
with green and blue tails.

Getting close to the ground for a different perspective on the white flower
on the dragonfly meadow

Ped-Bike bridge over flood canal inside Barker Reservoir