US Forest Service: Invasive Species
The US Forest Service manages a vigorous health program aimed, in part, at assisting local and state government and private owners identify and manage tree pests and diseases. This site offers information on major threats and resources for dealing with them.
This site is regularly updated with funding opportunities for urban forestry and green infrastructure projects from the US Forest Service.
This page includes guidance from the regulators on various methods to gauge impact of stormwater controls, especially non-structural. The resource includes little guidance on trees specifically, but broad coverage of both simple and complex modeling techniques.
Envision provides a framework for rating the economic, environmental, and community benefits of a wide range of infrastructure projects. It grades and evaluates projects based on 60 sustainability criteria.
This guide lays out the costs and benefits of selected tree species in the Northeast US, calculated for environmental values. It also provides a good explanation of how benefits are delivered and monetized.