Question: where does the colorado river in texas start and end
[{'answer': 'Dawson County', 'provenance': [{'wikipedia_id': '180969', 'title': 'Colorado River (Texas)', 'start_paragraph_id': 2, 'start_character': 117, 'end_paragraph_id': 2, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Gulf of Mexico , at Matagorda County , Texas'}]