Question: how many dams are in the colorado river
[{'answer': 'hundreds more on tributaries', 'provenance': [{'wikipedia_id': '39702599', 'title': 'List of dams in the Colorado River system', 'start_paragraph_id': 1, 'start_character': 364, 'end_paragraph_id': 1, 'end_character': 392, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'fifteen dams on the main stem of the Colorado'}, {'provenance': [{'wikipedia_id': '39702599', 'title': 'List of dams in the Colorado River system', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 593, 'bleu_score': 0.928036074738358, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3242266697002236476}, 'section': 'Section::::Abstract.'}]}]