Holland Brook has ten unnamed tributaries in Branchburg and Readington listed on NJDEP's website. They all are categorized as FW2-NT (fresh water second level classification generally not suitable for trout). Two named ones are below:    The first Holland Brook School was in Readington Village in the 19th century. In 1791, an act was passed "to incorporate societies for the advancement of learning". On August 4, 1804, Abraham Post, Peter Quick, Isaac Berkaw, William Dalley, William Spader, Cornelius Van Horn, Abraham Smock, Andrew Mattis, Adrian Stryker, Peter Ten Brook, William Ditmars and Derrick de Mott incorporated the Holland Brook School. One of the teachers at the school was Colonel John Mehelm. The site of Mehelm's house on New Bromley Road, which burned in the 1960s, has a historical marker in front of it. The school eventually changed names to Readington School and closed in 1897. The second and current Holland Brook School is a primary school for fourth and fifth grades and was built adjacent to the Readington Middle School.