The U.S. Geological Survey is seeking qualified businesses to update the Klamath Falls river basin model 10 (RBM10), including tasks such as water temperature data compilation, counterfactual scenario modeling, and manuscript preparation. This is a sources sought notice for market research only, not a request for proposals, and no contract will be awarded from this announcement. The applicable NAICS code is 541690 with a size standard of $19.0 million. Performance of services is implied to be related to the Klamath Falls area, though no specific location is stated. No budget amount or submission timeline is provided, as this notice is for planning purposes only.