Noxious Weeds - Situation

The noxious weed explosion for the Intermountain Region is depicted as following:

Year Acres Infested
1952 15,904
1975 95,493
1985 150,975
1995 864,940
2000 811,704
2005 592,757
2007 274,262

The increases and decreases in inventory in the last decade could be attributed to better detection and inventory processes, plus an eradication program on selected infestations.

The inventory for Fiscal Year 2007 shows the following acreage infested and treated for Intermountain Region Forests:

FOREST INFESTED ACRES ACRES TREATED
Ashley 6,650 2,345
Boise 11,320 4,836
Bridger-Teton 12,740 979
Caribou-Targhee 26,139 3,699
Dixie 1,526 893
Fishlake 27,405 15,228
Humboldt-Toyiabe 26,092 2,373
Manti-LaSal 3,295 1,458
Payette 15,684 2,166
Salmon-Challis 64,828 2,744
Sawtooth 9,000 1,690
Uinta 49,442 1,539
Wasatch-Cache 20,141 603
Total  274,262 40,468

Click the maps below to observe the regional map that shows the percent of forest acres infested by noxious weeds.

2000 Map

Image of a 2000 map that shows the percent of forest acres infested by noxious weeds. (304 Kb)

2007 Map

Image of a 2007 map that shows the percent of forest acres infested by noxious weeds. (286 Kb)





https://www.fs.usda.gov/detail/r4/landmanagement/resourcemanagement/?cid=fsbdev3_016117