 A variety of people @-@ oriented amenities are spread outdoors across the part of the refuge open to the public . One feature is an outdoor deck overhanging an embank that overlooks ponds at the refuge . This 50 @-@ foot ( 15 m ) long concrete deck is of a cantilevered design that extends 30 feet ( 9 @.@ 1 m ) over the embankment . Other amenities include footbridges , education sites , and walking trails . There are nearly five miles ( 8 @.@ 0 km ) of trails , but they are closed in the fall and winter . Centennial and River are two of the viewing areas along the trails , each offering a place to view wildlife . Photographers have access to blinds which allow them to take pictures without disturbing the wildlife . 
