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Parks, Recreation & Facilities

Posted on: July 18, 2017

City Begins Urban Forest Inventory in Portland


 Today, the City of Portland and the USDA Forest Service’sForest Inventory and Analysis (FIA) Program began an urban inventory of trees, green space, and ground cover on public and private land for the greater Portland metropolitan area. The crew began by visiting the Eastern Prom, Evergreen Cemetery, and Baxter Woods.

“More than 80 percent of the Nation’s population lives in urban areas, where urban forests are helping clean the air, reduce energy costs, and give people a vital connection to nature,” said Tony Ferguson, Director of the Northern Research Station and the Forest Products Laboratory. “The Forest Service’s Urban FIA Program is expanding to deliver knowledge that everyone engaged in urban nature resources can use to make forests healthy and sustainable.” 

"Portland is excited about our partnership with the US Forest Service's Urban FIA program to improve our city's trees and environment,” said Jeff Tarling, City Arborist. “The City of Portland has long been known as "the Forest City" and our trees help make our city a great place to live, work and visit. We're thankful that our Urban FIA partnership will help us keep the 'forest' in our Forest City!"

Tarling added, “this is a good project for Portland to better understand our overall vegetation makeup. We will survey our city-owned parcels first. The project scope is over the next five years with each year a different, random, parcel makeup. Portland is only the third city in New England selected to conduct this research.” 

The Forest Inventory and Analysis Program, often called “The Nation’s Forest Census,” has been monitoring the current status and past trends of the Nation’s rural forests for nearly 80 years. The FIA program has established itself as the only comprehensive, field-based and annually updated inventory of all forest ownerships for each of the 50 states in terms of measuring forest land. Recognizing the value of trees in cities, the FIA program is expanding the census to include the nation’s urban metropolitan areas. Forest Service research has documented that urban trees benefit communities and people in a variety of ways, including benefiting human health by removing air pollution, providing shade that helps reduce energy consumption, and providing areas for recreation. 

Just as FIA analysts have provided states with statistics on trees for decades, the program will now provide annual statistical updates for cities, with annual updates and more comprehensive analytical reports published online every 5 years. 

Two hundred Forest Inventory and Analysis plots will be inventoried over the next five years in Portland, with each plot measuring about 98 feet in diameter. Inventory plots are selected randomly without regard to ownership in an effort to ensure that the inventory is free from bias and reflects the true condition of a city’s urban forest resources. 

USDA Forest Service and City staff are contacting selected landowners in the greater Portland metropolitan area by mail, email, phone, or in person to ask permission to monitor trees and ground vegetation on their property. Participating in the Urban FIA program is voluntary. If permitted access to property, Forest Service staff (all of whom will be carrying identification cards) will be on site from between half an hour to 10 hours depending on the amount and condition of vegetation within the sample area. A variety of forest health factors will be monitored in the urban inventory, including: 

  • Tree species – What trees species exist and what are most abundant? 
  • Tree numbers and tree size – Is the urban area losing or gaining trees, and how quickly are trees growing?  
  • Tree survival and mortality – How well are trees surviving in the urban area?  
  • Tree crown condition – What is the overall health of a tree, how well is it growing, and how is it affecting plants growing underneath?
  • Tree Damage – Identifying damage will contribute to effective management plans. 
  • Invasive plants – What species exist, and what is their abundance, distribution and effects on urban areas? 
  • Ground Cover – Are there other plants, permeable (gravel, bare soil) or  impermeable surfaces (asphalt, cement)? 

The Urban FIA program will be operational in 26 cities this year. More information on the Forest Service’s Urban FIA Program is available at:  


Information on the FIA Program can be found at:   

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