I live in Texas working on a W.D. Contract, and am saleried nonexempt.
Our week starts on Saturday with a regular work week of Mon. - Fri. 40 hours . I as well as others worked Saturday witch would have normaly been OT and due to Hurricane Rita our company shut down 1/2 day Wend. and Thurs. and Fri.
We that worked Sat.- Wed. 1/2 day had our Sat. counted towards our reg. 40 hours and was not paid OT.
Those that did not work Sat. and worked Mon.- Wed. 1/2 day was paid 40 hours. Is this legal?

Generally speaking, unless you have an agreement that Saturday work will always be overtime, regardless of how many hours you work in a workweek, the company calculated correctly, i.e. the first 40 hours in a workweek are regular pay and then overtime kicks in. There is no labor law that requires overtime pay for working on your regularly scheduled day off.

However, I just noticed that you say that you are salaried nonexempt. Does that mean that your employer has previously paid you your full weekly salary (40 hours) even if you did not work all 40 in the workweek? I'm trying to determine if the employer is really paying you using the salaried nonexempt method, or if they are just calling it that.

I have only workrd with this company 7 mo. but have been with this contract for 11 Yrs.
Any time there has been a site closure (GOV.Working for sub.) we have been paid 40 in fact we are required to allways show 40 hours be it Sick,Vac,LWOP,ECT.
I hope this answers your question.