440
Also , a levee system was built by the United States Army Corps of Engineers after a severe flood , which degraded the riparian habitat .
 organization: United States Army Corps of Engineers
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: United States Army Corps of Engineers