CALTRANS TREE MORTALITY PROJECTS

A Caltrans tree mortality project to remove dead and dying hazardous trees follows nine (9) steps to ensure there is a consistent approach along state highways. The Statewide Tree Mortality Task Force (http://fire.ca.gov/treetaskforce/) provides aerial mapping and estimates of the number of dead trees per acre in High Hazard Zones. Tree mortality high hazard zones represent areas where tree mortality directly coincides with critical infrastructure, such as public roads. They represent clear threats. Caltrans contractors assess the health of every tree using a field crew under the direction of a Registered Professional Forester (RPF) and produce Tree Assessment Maps.

Methodology: High Hazard Zone Determination

permission to enter process

Disclaimer: Caltrans Tree Mortality Projects are shown using Geographic Information System (GIS) mapping. Since all mapping has a margin of error, information shown is for tree assessment purposes only, and to aid in the sharing of the approximate location of dead and dying hazardous trees along the state highway. Maps are intended to assist the public and Caltrans staff in effecitvely communicating the process before, during and after hazardous trees are removed.

Tree Assessment Maps

Route 28
Route 28
Route 50
Route 50
Route 89 Set 1
Route 89 Set 1
Route 89 Set 2
Route 89 Set 2
Route 168
Route 168
Route 174
Route 174
Route 174
Route 180
Route 190
Route 190
Route 193
Route 193
Route 267
Route 267
Route 41 madera and mariposa county map
41 Madera and Mariposa 06-OU950
Route 41 Mariposa county map
41 Mariposa 06-OU950
Route 49 El Dorado County map
49 El Dorado 03-2H680

49 Madera 06-2H660
Route
49 Nevada 03-2H680
Route
49 Placer 03-2H680
Route
49 Sierra 03-2H670
Route
49 Yuba 03-2H660
Route
89 El Dorado 03-2H650
Route
89 Placer 03-2H650
Route
155 Kern 06-OU940
Route
245 Fresno 06-OU940
Route
245 Tulare 06-OU940
Route
267 Nevada 03-2H9494
Route
267 Placer 03-2H9494
4 Alpine 10-1F641
4 Alpine 10-1F641
4 Calaveras 10-1F640
4 Calaveras 10-1F640
4 Calaveras 10-1F641
4 Calaveras 10-1F641
4 San Juan 10-1F640
4 San Juan 10-1F640
5 San Juan 10-1F640
5 San Juan 10-1F640
12 Calaveras 10-1F640
12 Calaveras 10-1F640
12 San Juan 10-1F640
12 San Juan 10-1F640
26 Amador 10-1F641
26 Amador 10-1F641
26 Calaveras 10-1F640
26 Calaveras 10-1F640
26 Calaveras 10-1F641
26 Calaveras 10-1F641
26 San Juan 10-1F640
26 San Juan 10-1F640
49 Amador 10-1F640
49 Amador 10-1F640
49 Calaveras 10-1F640
49 Calaveras 10-1F640
49 Mariposa 10-1F640
49 Mariposa 10-1F640
49 Tuolomne 10-1F640
49 Tuolomne 10-1F640
50 El Dorado County 03-1H6904 ED 50_22.5-66
50 El Dorado County 03-1H6904 ED 50_22.5-66
88 Alpine 10-1F641
88 Alpine 10-1F641
88 Amador 10-1F640
88 Amador 10-1F640
88 San Juan 10-1F640_SJ_88
88 San Juan 10-1F640_SJ_88
89 Alpine 10-1F641
89 Alpine 10-1F641
108 Tuolmne 10-1F640
108 Tuolmne 10-1F640
108 Tuolomne 10-1F642
108 Tuolomne 10-1F642
120 Mariposa 10-1F642
120 Mariposa 10-1F642
120 Stanislaus 10-1F640
120 Stanislaus 10-1F640
120 Tuolmne 10-1F640
120 Tuolmne 10-1F640
140 Mariposa 10-1F640
140 Mariposa 10-1F640
140 Mariposa 10-1F642
140 Mariposa 10-1F642
140 Merced 10-1F640
140 Merced 10-1F640
Caltrans District Map

Tree mortality is concentrated in High Hazard Zones. Tier 1 High Hazard Zones are areas where tree mortality directly coincides with critical infrastructure. They represent direct threats. Tier 2 High Hazard Zones are areas defined by watersheds (HUC 12, average 24,000 acres) that have significant tree mortality as well a ssignificant community and natural resource assets.

 

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