Abstract: A mosquito barrier for use in catch basins and other water drainage structures is provided. The mosquito barrier is designed to prohibit an adult mosquito from penetrating the barrier, reaching standing water and laying eggs. Further, the mosquito barrier prohibits mosquitoes emerging from eggs laid downstream from emerging through a catch basin protected by the barrier of the present invention. The barrier is made with mesh of a size prohibitive to mosquito penetration while allowing water to flow through freely. The barrier rests within the catch basin, or other water drainage structure, well above the surface of standing water, such that all entering water must pass therethrough, and allows water to enter and flow through the structure with little flow restraint.