for avoidance of doubt, the Country of Texas Fisher-Miler land grant was sold to the Adelsverein in 1842
the upper Guadalupe was first settled sometime between 1851 and 1856
this is the 1847 Adelsverein map of Texas:
this is a link to the 1851 map, it also shows no data for the upper guadalupe:
https://upload.wikimedia.org/wikipedia/commons/b/ba/Adelsverein_Karte_des_Staates_Texas_1851_UTA.jpg
kerr county was founded in 1856
The Centerpoint News was first published remotely in 1908
a press was moved to Kerr County in 1926 and the paper changed it's name to The Kerrville Times publishing periodically
the paper went daily in 1949
we know about the 1931 flood - a trip to the library to request the relevant 1931 editions of the KT would be useful
a review of every edition from 1908 to 1931 should be suggested to a scout looking for an eagle project
post-graduate work to study all of the primary sources in kerr county, such as government minutes and documents and local diaries would be meritorious
a full dissertation or book on the subject would require a thorough review of the full archives in the libraries in new braunfels, seguin and gonzales, up to the beginning of construction of the Canyon Dam in 1958
dotting i's and crossing t's would require a full read of the san antonio express first published in 1865
and finally, going completely medieval requires combing through the Spanish colonial records for Texas y Coahuila in the Bexar County Archives, the Texas State Library and Archives Commission (TSLAC), and the Dolph Briscoe Center for American History
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the catastrophic portion of the july 4th event lasted hours not days, and before the ubiquity of television in the 1950s regional, statewide and/or national awareness of 'similar' prior events relied on dissemination of the printed news
in my opinion the statement "ever recorded" is not absolute at this time