Eastern Mojave Vegetation Magpie Gulch, Jefferson County, Colorado.
 
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See also: Golden.

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Small gulch emptying into Clear Creek at north side of Golden.

Name not recognized by U. S. Board on Geographic Names.

Field Trip Stop 14 — Highway 6-58-93 Junction — of Noe, et al. (1999) illustrates the Golden Fault, associated landslide hazards, mitigation of landslide hazards, and the short public memory.

Looking to the north and south, we can see the distinctive hogback of the Dakota Sandstone at both ends of the valley. But why is this hogback missing at the valley center? The answer is that the Golden Fault, a large, Laramide thrust fault, weaves along the valley just to the east of the mountain front. Here, the fault has displaced nearly 8,000 feet of the Paleozoic and Mesozoic, sedimentary section (Van Horn, 1976). The trace of the fault can be seen as it cuts up the side of the first large alluvial terrace to the south of Clear Creek. There is a distinct break in the vegetation between the Fountain Formation to the west (covered with mountain mahogany shrubs) and the Pierre Shale to the east (covered with grasses).

Looking directly west, we see a road cut for State Highway 93. This portion of the highway was first constructed in 1991. A small landslide formed in the west (opposite) face of the cut shortly thereafter, and the resulting toe bulge closed the southbound lanes of the new highway. Within a year, the landslide had developed a rim of head scarps with up to 12 feet of vertical slippage, and had captured the surface flow of a small stream in Magpie Gulch. Early efforts to drain the landslide were unsuccessful. A full geologic investigation subsequently revealed that the landslide sits directly atop the Golden Fault, with low-permeability Pierre Shale on the eastern side and a wedge of fractured, permeable Fountain Formation on the western side. In 1994, three lines of rock anchors (about 40 anchors in total) were installed across the landslide. The Magpie Gulch stream was piped across the head scarps, longer horizontal drains were installed, and a remote data-logging unit was set up. To date, this mitigative effort appears to have been successful. The combined maintenance and mitigation operations for this incident are reported to have cost about 3 million dollars.

The houses to the north of the landslide were built shortly after the landslide was mitigated and all signs of its existence had been “erased” from view. One can only imagine the concern of these residents had the landslide been active a few years later. This is a good illustration of the often short-term public memory of geologic hazards.


Elevation: 5900ft, 1799m.

Articles that refer to this location:

 

Literature Referring To This Location:

Area Plant Lists that contain this location:

Species collected at or near this location.

This list summarizes plants collected or observed at this specific, named location. It does not include plants collected or observed at nearby named or unnamed locations. It may be more instructive to use the Area Lists that contain this location.

  • TAS – The plant was collected by Tom Schweich.
  • Oth – The plant was collected by someone, but not Tom.
  • Obs – The plant was observed, but not collected.

Cupressaceae

Juniperus scopulorum Sarg. Rocky Mountain Juniper (Obs)

Pinaceae

Pinus ponderosa Laws. Ponderosa Pine (Obs)

Pseudotsuga menziesii (Mirb.) Franco. Douglas Fir (Obs)

Anacardiaceae

Rhus glabra L. Smooth Sumac (Obs)

Rhus trilobata Nutt. Squawbush (Obs)

Toxicodendron rydbergii (Small ex Rydb.) Greene. Western Poison Ivy (Obs)

Apiaceae

Conium maculatum L. Common Poison Hemlock (Obs)

Lomatium orientale J.M. Coult. & Rose. Salt-and-Pepper (TAS+Obs)

Asteraceae

Anthemideae

Achillea millefolium L. Common Yarrow (Obs)

Artemisia frigida Willd. Prairie Sagewort (Obs)

Artemisia ludoviciana Nutt. Silver Wormwood (Obs)

Astereae

Chrysopsidinae

Heterotheca villosa (Pursh) Shinners. Hairy False Goldenaster (Obs)

Conyzinae

Erigeron divergens Torr. & A. Gray. Spreading Fleabane (Obs)

Machaerantherinae

Grindelia squarrosa (Pursh) Dunal. Curlycup Gumweed (Obs)

Symphyotrichinae

Symphyotrichum porteri (A. Gray) G.L. Nesom. Smooth White Aster (TAS)

Cardueae

Carduinae

Cirsium arvense (L.) Scop. Canada Thistle (Obs)

Cirsium vulgare (Savi) Ten. Bull Thistle (Obs)

Cichorieae

Microseridinae

Lygodesmia juncea (Pursh) D. Don ex Hooker. Rush Skeletonplant (Obs)

Scorzonerinae

Tragopogon dubius Scop. Yellow Salsify (Obs)

Eupatorieae

Liatris punctata Hook. Dotted Blazing Star (Obs)

Gnaphalieae

Pseudognaphalium canescens (DC.) Anderberg. Wright's Rabbit-Tobacco (Obs)

Heliantheae

Helianthus pumilus Nutt. Little Sunflower (Obs)

Heliomeris multiflora Nutt. multiflora. Showy Golden Eye (TAS)

Senecioneae

Packera fendleri (A. Gray) W.A. Weber & Á. Löve. Fendler’s Ragwort (Obs)

Senecio integerrimus Nutt. Columbia Ragwort (Obs)

Berberidaceae

Berberis repens Lindl. Creeping Barberry (Obs)

Boraginaceae

Cynoglossum officinale L. Gypsyflower (Obs)

Hydrophyllum fendleri (A. Gray) A. Heller. Fendler's Waterleaf (Obs)

Lappula occidentalis (S. Watson) Greene. Flatspine Stickseed (Obs)

Lithospermum incisum Lehm. Narrowleaf Stoneseed (Obs)

Lithospermum occidentale (Mack.) Weakley, Witsell & D. Estes. Western Marbleseed (Obs)

Mertensia lanceolata (Pursh) DC. Prairie Bluebells (Obs)

Phacelia heterophylla Pursh. Varileaf Phacelia (Obs)

Brassicaceae

Alyssum simplex Rudolphi. European Madwort (Obs)

Arabis pycnocarpa M. Hopkins pycnocarpa. Cream Flower Rockcress (Obs)

Descurainia pinnata (Walter) Britton brachycarpa (Richardson) Detling, Amer.Midl. Naturalist. 22: 509. Western Tansymustard (TAS)

Erysimum capitatum (Hook.) Greene. Sanddune Wallflower (Obs)

Physaria montana (A. Gray) Greene. Mountain Bladderpod (Obs)

Thlaspi arvense L. Field Penny Cress (Obs)

Turritis glabra L. Tower Rockcress (Obs)

Cactaceae

Echinocereus viridiflorus Engelm. Nylon Hedgehog Cactus (Obs)

Opuntia macrorhiza Engelm. Western Pricklypear (Obs)

Opuntia polyacantha Haw. Plains Pricklypear (Obs)

Campanulaceae

Campanula rotundifolia L. Harebell (Obs)

Cannabaceae

Celtis occidentalis L. Western Hackberry (Obs)

Celtis reticulata Torr. Net-Leaved Hackberry (Obs)

Caprifoliaceae

Symphoricarpos rotundifolius A. Gray. Roundleaf Snowberry (Obs)

Caryophyllaceae

Cerastium arvense L. Field Chickweed (Obs)

Cerastium arvense L. strictum Gaudin. Field Chickweed (Obs)

Pseudostellaria jamesiana (Torr.) W. A. Weber & R. L. Hartm. Tuber Starwort (Obs)

Saponaria officinalis L. Bouncingbet (Obs)

Chenopodiaceae

Chenopodium album L. Lambsquarters (Obs)

Convolvulaceae

Evolvulus nuttallianus Roem. & Schult. Shaggy Dwarf Morning Glory (Obs)

Crassulaceae

Sedum acre L. Goldmoss Stonecrop (Obs)

Sedum lanceolatum Torr. Spearleaf Stonecrop (Obs)

Elaeagnaceae

Elaeagnus angustifolia L. Russian Olive (Obs)

Euphorbiaceae

Euphorbia esula L. Leafy Spurge (Obs)

Euphorbia peplus L. Petty Spurge (TAS)

Tragia ramosa Torr. Branched Noseburn (Obs)

Fabaceae

Lupinus L. Lupine (Obs)

Oxytropis lambertii Pursh. Purple Locoweed (Obs)

Pediomelum tenuiflorum (Pursh) A. N. Egan. Slimflower Scurfpea (Obs)

Robinia pseudoacacia L. Black Locust (Obs)

Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richardson divaricarpa (A. Nelson) Isely. Spreadfruit Goldenbanner (Obs)

Vicia L. Vetch (Obs)

Fumariaceae

Corydalis aurea Willd. Scrambled Eggs (TAS+Obs)

Geraniaceae

Geranium viscosissimum Fisch. & C. A. Mey. ex C. A. Mey. Sticky Purple Geranium (Obs)

Grossulariaceae

Ribes cereum Douglas. Wax Currant (Obs)

Hypericaceae

Hypericum perforatum L. Common St. John's Wort (Obs)

Lamiaceae

Marrubium vulgare L. Horehound (Obs)

Mentha spicata L. Spearmint (Obs)

Monarda fistulosa L. Wild Bergamot (Obs)

Salvia L. Sage (Obs)

Scutellaria brittonii Porter. Britton's Skullcap (Obs)

Loasaceae

Mentzelia. Blazing Star (Obs)

Mentzelia albicaulis (Douglas ex Hook.) Douglas ex Torr. & A. Gray. White-Stem Blazing Star (TAS)

Malvaceae

Sphaeralcea coccinea (Nutt.) Rydb. Cowboy's Delight (Obs)

Oleaceae

Fraxinus pennsylvanica Marshall. Green Ash (Obs)

Syringa vulgaris L. Common Purple Lilac (Obs)

Onagraceae

Oenothera coronopifolia Torr. & A. Gray. Crownleaf Evening Primrose. Hierba de San Juan. (Obs)

Oenothera suffrutescens (Ser.) W. L. Wagner & Hoch. Linda Tarde (Obs)

Plantaginaceae

Collinsia parviflora Lindl. Maiden Blue-eyed Mary (Obs)

Linaria dalmatica (L.) Mill. Dalmatian ToadFlax (Obs)

Penstemon Schmidel. Beard Tongue (Obs)

Penstemon secundiflorus Benth. Sidebells Penstemon (Obs)

Penstemon virens Pennell ex Rydb. Front Range Beardtongue (Obs)

Polemoniaceae

Gilia ophthalmoides Brand. Pinyon Gilia (TAS)

Phlox multiflora A. Nelson. Mountain Phlox (Obs)

Polygonaceae

Eriogonum alatum Torrey in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers. 168, plate 8. 1853. Winged Buckwheat (Obs)

Eriogonum effusum Nuttall, Proc. Acad. Nat. Sci. Philadelphia. 4: 15. 1848. Spreading Buckwheat (Obs)

Eriogonum jamesii Bentham in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 14: 7. 1856. Jame's Buckwheat (Obs)

Fallopia convolvulus (L.) A.Löve. Black Bindweed (Obs)

Rumex venosus Pursh. Veiny Dock (Obs)

Primulaceae

Dodecatheon pulchellum (Raf.) Merr. Beautiful Shootingstar (TAS+Obs)

Ranunculaceae

Clematis L. Clematis (Obs)

Delphinium carolinianum Walter virescens (Nutt.) R.E. Brooks. Plains Larkspur (Obs)

Delphinium nuttallianum Pritz. Twolobe Larkspur (Obs)

Rosaceae

Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem. Saskatoon Serviceberry (Obs)

Cercocarpus montanus Raf. Alder-Leaf Mountain Mahogany (Obs)

Crataegus erythropoda Ashe. Cerro Hawthorn (TAS)

Crataegus succulenta Schrad. ex Link. Fleshy Hawthorn (Obs)

Malus L. Apple (Obs)

Potentilla fissa Nutt. ex Torr. & A.Gray. Bigflower Cinquefoil (Obs)

Physocarpus monogynus (Torr.) J.M. Coult. Mountain Ninebark (Obs)

Prunus virginiana L. Chokecherry (Obs)

Rosa woodsii Lindl. Mountain Rose (Obs)

Rubus deliciosus Torr. Delicious raspberry (Obs)

Rubiaceae

Galium aparine L. Sticky Willy, Cleavers (Obs)

Salicaceae

Populus × acuminata Rydb. Lanceleaf Cottonwood (Obs)

Populus angustifolia E. James. Narrowleaf Cottonwood (Obs)

Populus deltoides Marshall monilifera (Aiton) Eckenw. Plains Cottonwood (Obs)

Salix exigua Nutt. Coyote Willow, Narrow-Leaved Willow (Obs)

Santalaceae

Comandra umbellata (L.) Nutt. pallida (A. DC.) Piehl. Pale Bastard Toadflax (Obs)

Sapindaceae

Acer glabrum Torr. Rocky Mountain Maple (Obs)

Saxifragaceae

Heuchera parvifolia Nutt. ex Torr. & A. Gray. Littleleaf Alumroot (TAS)

Scrophulariaceae

Scrophularia lanceolata Pursh. Lanceleaf Figwort (Obs)

Verbascum thapsus L. Common Mullein (Obs)

Ulmaceae

Ulmus pumila L. Siberian Elm (Obs)

Urticaceae

Parietaria pensylvanica Willd. Pennsylvania Pellitory (TAS)

Violaceae

Viola nuttallii Pursh. Nuttall's Violet (Obs)

Vitaceae

Parthenocissus Planchon. Virginia Creeper (Obs)

Vitis riparia Michx. Riverbank Grape (Obs)

Agavaceae

Yucca glauca Nutt. Soapweed Yucca (Obs)

Alliaceae

Allium textile A. Nelson & J.F. Macbr. Textile Onion (TAS+Obs)

Anthericeae

Leucocrinum montanum Nutt. ex A. Gray. Star Lily (Obs)

Asparagaceae

Asparagus officinalis L. Asparagus (Obs)

Commelinaceae

Tradescantia occidentalis (Britton) Smyth. Prairie Spiderwort (Obs)

Cyperaceae

Carex L. Sedge (Obs)

Eleocharis R. Br. Spikerush (Obs)

Iridaceae

Iris L. Horticultural Iris (Obs)

Poaceae

Andropogoneae

Sorghastrum nutans (L.) Nash. Yellow Indian Grass (Obs)

Aristideae

Aristida purpurea Nutt. Purple Threeawn (Obs)

Aveneae

Koeleria macrantha (Ledeb.) Schult. Prairie Junegrass (Obs)

Bromeae

Bromus inermis Leyss. Smooth Brome (Obs)

Bromus tectorum L. Cheat Grass (Obs)

Cynodonteae

Munroa squarrosa (Nutt.) Torr. False Buffalograss (Obs)

Eragrostideae

Sporobolus cryptandrus (Torr.) A. Gray. Sand Drop-seed (Obs)

Poeae

Festuca trachyphylla (Hack.) Krajina. Hard Fescue (TAS)

Poa. (TAS)

Poa pratensis L. Kentucky Bluegrass (Obs)

Stipeae

Hesperostipa comata (Trin. & Rupr.) Barkworth. Needle and Thread (Obs)

Total number of taxa: 141
Native Taxa:
(serif, italic, bold)
104
Exotic Taxa:
(sans-serif, italic)
28
Nativity Undetermined:
(default font, italic)
9
Listed Weeds:
Identified as Weed
0
If you have a question or a comment you may write to me at: tas4@schweich.com I sometimes post interesting questions in my FAQ, but I never disclose your full name or address.  


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Date and time this article was prepared:11:54:33 AM, 6/16/2024.