You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where does the colorado river in texas start and end?" whose answer is Dawson County.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Colorado River Texas start and end
Useful Output:

Doc 1: It rises in intermittent draws in northeastern Dawson County (at 32°41' N, 101°44' W), flows generally southeastward for 600 miles across
Doc 2: Colorado River, major river of North America, rising in the Rocky Mountains of Colorado, U.S., and flowing generally west and south for 1450
Doc 3: The 862-mile (1,387 km) long river flows generally southeast from Dawson County through Marble Falls, Austin, Bastrop, Smithville, La Grange,
Doc 4: More than 800 miles long, the Texas Colorado River is the longest river to start and end in the same state and is the lifeblood of our state's economy.
Doc 5: In short, no. The Colorado River begins in the southern Rocky Mountains in Colorado west of the Continental Divide, flowing across the state