Wow, FRiend! I didn't even know it had rained in the Hill Country...
It does look like you're in a 'melluvahess'!
The 2900 bridge I see on Google Earth is no culvert over a dry wash; it's a major, concrete TxDOT bridge, nearly 1/4 mile long -- over the upper end of Lake Marble Falls!
That's a substantial bridge! Is it actually down -- or is it (and/or its approaches) "merely" underwater?
It sounds like you're on the south shore across from Kingsland. If so, it looks like the closest bridge across the Colorado is at Marble Falls -- roughly 25 miles away! And your closest (by road) source of supplies may be Llano -- 20+ miles north..
Please keep us updated as to how you're getting along -- and what TxDOT (not my favorite TX agency -- based on the Rick Williamson/TTC days) is doing to solve your ingress/egress problem!
(Of course, I'm hoping that you, being a resourceful TX resident, have kept your boat safe and handy...) '-)
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Hope you don't mind prayers -- 'cause I'm a-doin' it anyway... '-)
All the best,
TXnMA
(Safe, high, & dry atop our watershed ridge over (6 hrs & 350 miles away) here in the northeastern TX PineyWoods...)
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