One of the three people missing in outback Central Australia has been found alive during police search efforts today.

Tamra McBeath-Riley, 52 was found after police located the vehicle the trio were travelling in bogged in a river bed.

Ms McBeath-Riley will be transported to the Alice Springs Hospital where she will receive treatment for dehydration and exposure.

Claire Hockridge and Phu Tran remain missing in the area and police will step up their search efforts in hope to finding the pair before nightfall.

No further information is available at this stage.