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Seattle Tree Inventory
 Inventory Data for trees maintained by the Seattle Department of Transportation was updated in 2007 and 2008. SDOT has continued to update plantings in the inventory and currently has approximately 40,000 city maintained trees that are inventoried.
Since the initial inventory was completed in 1992, over 25,000 street trees have been planted. The sources of these trees have been SDOT Capitol Improvement Projects and BTG Plantings, City Light’s Urban Tree Replacement Program, the Department of Neighborhoods Tree Fund, Private Development, and private citizens. Today, approximately 130,000 trees exist along Seattle's streets.
We are pleased to make individual tree information available to the public via our new web based street tree map. Users can obtain the common and scientific name, the inventory identification number, diameter, street address, party responsible for maintenance, the date the tree was planted or inventoried, and the date that the tree was last checked by clicking on an individual tree. Please Note: Trees that were inventoried in 1990 – 92 will not display diameter information unless the “Last Verified Date” field is populated with a recent date. Data in this map is for general information purposes only, and should not be used for plan review or other “official” purposes.
Click here to view the Online Tree Map
After reviewing the tree map, if you wish to submit current size information for an existing tree click here - or if you wish to submit information for an unlisted tree click here.
Top Seven Genera of Street Trees - % of Total in Inventory
|
Tree Type |
1994 |
2011 |
Prunus (Flowering Cherries and Plums) |
26% |
21% |
Acer (Maples) |
17% |
20% |
Crataegus (Hawthornes) |
8% |
6% |
Malus (Crabapples) |
5% |
5% |
Tilia (Lindens) |
4% |
3% |
Quercus (Oaks) |
4% |
4% |
Liquidambar (Sweetgums) |
4% |
3% |
Top Seven Species of Street Trees - % of Total in Inventory
| 1994 |
|
2011 |
Prunus cerasifera (Cherry Plums) |
7.2% |
|
Prunus serrulata (Flowering Cherry) |
9.1% |
Prunus serrulata (Flowering Cherry) |
7.2% |
|
Prunus cerasifera (Cherry Plums) |
9.0% |
Acer rubrum (Red Maples) |
5.6% |
|
Acer rubrum (Red Maples) |
5.3% |
Crataegus laevigata (English Hawthorne) |
5.5% |
|
Malus spp. (Crabapple) |
5.2% |
Acer platanoides (Norway Maples) |
4.5% |
|
Acer platanoides (Norway Maples) |
5.0% |
Liquidambar styraciflua (Sweetgum |
3.9% |
|
Crataegus laevigata (English Hawthorne) |
4.0% |
Malus spp. (Crabapple) |
3.9% |
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Liquidambar styraciflua (Sweetgum) |
3.3% |
Note: The statistics for size, health and condition have not been adjusted from the 1994 numbers, as only a small percentage of privately maintained trees have had information updated since the initial data collection.
Size (trunk diameter) - % of Total
0 to 6 inches - 46%
6 to 12 inches - 34%
12 to 24 inches - 17%
24 to 36 inches - 02%
36+ inches - 01%
Health of Existing Trees
In 1994, Seattle Transportation conducted a health study of the city's 84,000 street trees. Each tree's health was rated from 1 (poor) to 5 (great). 59% of the trees ranked ranged from good to great. 42% of the trees ranged from poor to over half-dead. Many of the trees suffer from one or more problems, including trunk-area decay, canopy defoliation, tree topping, branch structure defects and root structure problems.
The Overall Condition of Seattle's Trees - % of Total - Actual Number
Over half dead - 3% - 2,214
1/4 to 1/2 dead - 8% - 6,927
Poor - 31% - 26,211
Good - 34% - 28,860
Excellent - 25% - 19,704
For more information, call the City Arborist's office at 206-684-TREE (8733).
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