2005 California Desert Exotic Mustard Roadside Survey

Interstate 8 - California, Imperial County
May 2005 - Raw data.

Surveyed and Copyright © 2005 by Craig Dremann

Box 361, Redwood City, CA 94064 - (650) 325-7333


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PICTURES

Sahara mustard



Interstate 8 - California - May 2005 - Raw data.

Results of a 70 mph windshield survey (or whatever the local speed limits were), for Sahara Mustard (Brassica tournefortii): Either not present; is present along roadsides or in medians; or is outside of the roadside to the fence line or has moved from the roadsides to infest adjacent land.

NS = None Seen. No Sahara mustard was seen along roadside ditches; or if divided highway, also not seen in the roadside median, or in lands adjacent to the road.

RS = Road Sides were infested with Sahara mustard. MED = In divided highways, in medians.

DES = Sahara mustard has moved from the roadsides into the desert, agricultural areas, or other lands adjacent to the roadsides. FL = Only found along the highway cyclone-fence line, but is far enough off the roadside to pose an immediate problem for the lands adjacent to the fences. At the time of the survey, did not appear to be moving off the fence line yet.

SPECIES SURVEYED for:

BT = Brassica tournefortii or Sahara Mustard

PM = Post miles along highways, and numbers indicate the averages found not just at each post mile, but for 1/2 mile on either side of the post mile marker.

(Landmarks and other notes on other exotics or native plants will be in parentheses)



IMPERIAL COUNTY, fromtown of Ocotillo, east to Arizona border

Survey 5/18/2005, notebook 193, pages 48-53, 56-59-B

(Post Miles)

Very vulnerable cresotoe desert starts, overgrazed to dust, originally a solid desert stipa grassland understory.

12 -
NS - Town of Ocotillo
13 -
RS scattered, thick in places
14 -
NS - South Fork Coyote Wash
15 - 
DES and RS, scattered
16 -
RS, scattered, badlands
17 -
RS, very rare, 20 plants
18 -
NS - badlands, desert stipa
19 -
NS - badlands
20 -
NS - badlands
21 -
NS - badlands
22 -
RS scattered
23 -
RS ditches
24 -
NS - Creosote, desert stipa - Plaster City
25 -
NS - agriculture lands
26 -
NS - agriculture lands
27 -
NS - agriculture lands
28 -
NS - agriculture lands
29 -
NS - agriculture lands
30 -
NS - agriculture lands - New River)
31 -
NS - agriculture lands
32 -
NS - agriculture lands
33 -
NS - agriculture lands
34 -
NS - agriculture lands
35 -
NS - agriculture lands
36 -
NS - agriculture lands
37 -
NS - City of El Centro
38 -
NS - City of El Centro
39 -
NS - end of City of El Centro
40 -
NS - agriculture lands
41 -
NS - agriculture lands - Junction Cal. Hwy. 111)
42 -
NS - agriculture lands
43 -
NS - agriculture lands
44 -
NS - agriculture lands
45 -
NS - agriculture lands
46 -
NS - agriculture lands
47 -
NS - agriculture lands
48 -
NS - agriculture lands - Junction of the new Cal. Highway 7
49 -
NS - agriculture lands
50 -
NS - agriculture lands
51 -
NS - agriculture lands
52 -
NS - agriculture lands
53 -
NS - agriculture lands
54 -
NS - agriculture lands
55 -
RS and MED scattered
56 -
RS and MED scattered
57 -
RS and MED scattered
58 -
RS and MED scattered
59 -
RS and MED scattered
60 -
RS and MED scattered
61 -
RS and MED scattered
62 -
RS and MED scattered
63 -
RS and MED scattered
64 -
RS and MED scattered

Starting at this point, going eastward to the Colorado River, is very vulnerable creosotes on pedicles sometimes 3 feet tall with only a Schimus understory and no natives, probably originally solid Desert Stipa grasslands understory.

65 -
RS and MED scattered
66 - RS and MED scattered

Junction Cal. 98
67 - RS MED - scattered
68 - RS MED - rare
69 - RS MED - scattered
70 - RS MED - rare
71 - RS MED - rare
72 - RS MED - scattered
73 - RS MED - scattered
74 - RS MED - rare to scattered
- All American Canal
75 - RS MED - rare to scattered
76 - RS MED - rare to scattered
77 - RS MED - rare -
Sand dunes begin westbound
78 - RS MED - rare
- Sand dunes
79 -
NS - Sand dunes
80 -
NS - Rest stop
81 -
NS - Sand dunes
82 - RS MED - scattered - All American Canal, caught in fence of canal
83 -
NS - sand dunes
84 - RS MED - very rare
85 - RS - rare
86 - RS MED, scattered at bottom of ditch, thick along north fences
87 - RS MED, scattered at bottom of ditch, thick along north fences

88 -
RS and MED - scattered
89 -
RS and MED - scattered - CAL. AG. Inspection station
90 -
RS and MED - scattered
91 -
RS and MED - scattered - All American Canal
92 -
RS and MED - scattered
93 -
NS - floodplain vegetation
94 -
RS at cloverleaf, Winterhaven - floodplain vegetation
95 -
NS - floodplain vegetation
96 -
NS - floodplain vegetation
97 -
NS - Colorado River - California-Arizona state line


See Arizona's section of I-8 here



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