Houston

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A crew plants trees above Houston's Buffalo Bayou beneath the downtown skyline Friday, April 18, 2014. The city is spending $58 million to improve the waterway and the surrounding parks and bike and jogging trails. (AP Photo/Pat Sullivan)

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A young boy rides his bicycle along Houston's Buffalo Bayou as it snakes its way into downtown below a highway overpass, Friday, April 18, 2014. The city is spending $58 million to improve the waterway and the surrounding parks and bike and jogging trails. (AP Photo/Pat Sullivan)

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Houston's Buffalo Bayou as it snakes its way into downtown below a highway overpass Friday, April 18, 2014. The city is spending $58 million to improve the waterway and the surrounding parks and bike and jogging trails. (AP Photo/Pat Sullivan)

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Trash and debris are corralled and scooped up from Houston's Buffalo Bayou near downtown Friday, April 18, 2014. The city is spending $58 million to improve the waterway and the surrounding parks and bike and jogging trails. (AP Photo/Pat Sullivan)

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A railing from an apartment complex and the Houston skyline overlook the Buffalo Bayou as it snakes its' way into downtown Friday, April 18, 2014. The city is spending $58 million to improve the waterway and the surrounding parks and bike and jogging trails. (AP Photo/Pat Sullivan)