Texas Escapes: O'Donnell, Texas - Information on history and attractions, Dan Blocker AKA Hoss Cartwright of Bonanza fame, and O'Donnell Museum. O'Donnell Independent School District - Includes links to each campus, district information, and events. O'Donnell, Texas - Personal page of James O'Donnell, a visitor to the city, with some photographs. Roadside America: Dan Blocker's Monument - Road report and review on the Monument to Dan Blocker, TVs Hoss Cartwright. Handbook of Texas Online: Dan Blocker - Information on the actor who played Hoss Cartwright on the television series Bonanza. He was a native of O'Donnell. Handbook of Texas Online: O'Donnell - Community history and information. The Weather Channel - O'Donnell, Texas - Local forecast, current conditions, radar, and links for national and international weather information.