Hi Brian -- thanks for posting to History Hub!
It looks like the House Committee on Irrigation of Arid Lands held a series of hearings published with the same title over multiple Congresses: "Protection and Development of Lower Colorado River Basin".
In the 67th Congress (1921-1923), the topic was taken up in the bill H.R. 11449. Here's a link to the hearing, available via Hathi Trust.
In the 68th Congress (1923-1925), the topic was taken up in the bill H.R. 2903. Here's a link to the series of hearings, available via Hathi Trust. The hearing held on Feb. 23, 1924 is in Part 2 of this series.
Congressional hearings can generally be found online through sources like Hathi Trust, Google Books and the Internet Archive. However, if you have access to an academic or law library I'd recommend looking for ProQuest Congressional -- a subscription database with a module that has the full text of all hearing transcripts. ProQuest is the most comprehensive way to search for hearings.
If neither of these two are the hearing you're searching for, can you please provide additional information as to the topic you're interested in? You're also welcome to email us directly at email@example.com.
Thank you very much. That is most helpful.