Portions of the Sugar Land and Missouri City area remain under mandatory evacuation orders Tuesday as the Brazos River continues to rise in what county officials are calling an 800-year flood event.   All hospitals in Sugar Land except for Sugar Land Methodist Hospital are closed Tuesday morning because they are at capacity, according to the city. Check the city's website for updates throughout the day. Due to rapidly deteriorating weather conditions yesterday, Sugar Land's city streets are no longer safe due to widespread flooding conditions, according to an updated statement from the city. Levee improvement districts have closed their outfalls to protect from river flooding, and levee operators are using pumps to remove rain that falls within the levees. The National Weather Service is forecasting rain amounts that may exceed the capacity of the pumps, according to the city. Residents are encouraged to stay home and wait until flood waters recede. Those stranded in Sugar Land due to flood water should call 281-275-2700 so the city can document your locations.   The projected crest height of the Brazos River has been lowered to 57.5 feet, down from 59 feet as of Tuesday morning. Sugar Land needs volunteers and donations are needed such as nonperishable food, water and towels. In addition, volunteers living outside of an evacuation area who are willing to welcome and host fellow residents in their homes are needed. Individuals can learn about the needs by emailing [email protected].   In Missouri City, the Rec & Tennis Center at 2701 Cypress Point Drive, is not being used as a shelter; it is being used as a staging area for residents who are being transported there to wait to be transferred to a shelter, according to the city. Residents are urged not to go there for shelter; you must be transported there by our public safety officials. In addition, Missouri City Middle School is also not a shelter; Kempner High School, 14777 Voss Road, Sugar Land, will open as a shelter at 1 p.m., according to the city. An interactive GIS map is available for residents to check on the status of streets in Missouri City. Once residents enter their address, they can click on the “Near Me” button on the top right of the screen to see which streets might be flooded in their area, according to the city's website.