Green River through Dinosaur National Monument

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#1)  Green River through Dinosaur National Monument

Postby tsharp » Mon Oct 26, 2015 8:17 am

Sixteen of us put in on the Green River at the Gates of Lodore Campground in Colorado on 7/23/2015 and spent six days on the river with a take out at Split Mountain in Utah.  This section of Green River requires a permit to run which is obtained through a lottery system. We traversed 45  river miles with an elevation drop of 620 feet. Rapids are class 2-3 at low/moderate flows of 1000-3000 cfs that we encountered. It runs through Dinosaur National Monument and passes the confluence of the Yampa River at Echo Park. Scenery is a series of beautiful canyons ranging from 2-3,000 feet deep. Going downstream the canyons are Canyon of Lodore- 16 miles, Whirlpool Canyon- 9 miles, Split mountain Canyon- 7 miles. The Powell expedition of 1871 named the Canyon of Ladore after a familiar poem of the time. Likewise a rapid named Disaster Falls is still used to denote a rapid in which his party had a boat destroyed.
I measured a few trees at most of the stops we made along the river.

The largest of each species measured are listed below.
Fremont Cottonwood (Populus fremontii) 11.6' x 70.1' (UT), 12.8' x 39.7' (CO)
Ponderosa Pine (Pinus ponderosa var. scopulorum)  # x 46.4' (CO)
Arizona Boxelder (Acer negundo var. arizonica) 3.9' x 41.9' (UT)
Douglas-fir (Psuedotsuga menzeii var. glauca) 3.5' x 41.6' (CO)
Single Seed Juniper (Juniperus monosperma) 4.9' x 35.2' (CO), 8.5' x 31.1'(CO)
Netleaf Hackberry (Celtis laevigata var. reticula 3.1' x 25.6' CO
Utah Juniper (Juniperus osteosperma) 5.2' @ 3' x 25.3' (CO)
Two Needle Pinyon (Pinus edulis) 1.9' x 18.8' (CO)
Singleleaf Ash (Fraxinus anomola) 2.5' x 16.5' (CO)
Blue Elderberry (Sambucus nigra var. cerullea)1.0' x 13.9' (UT)
Big Sage Brush (Artemisa tridenta) 1.3' @ 4' x 12.5'(CO)

It is somewhat unusual to get ten species in a western area to get a Rucker -10 height index. RH-10 = 33.5' which sets a record for me as shortest index i have encountered. But after all it is part of the Great Basin Desert and only receives 10-12 inches of rain a year.
The most common tree encountered was the Arizona Boxelder. If one would measure farther from the river then the Utah Juniper and two -needle Pinyon Pine would probably be the most common.
While companions were counting Bighorn sheep I was enjoying a tree I had never seen previously. That was the Singleleaf Ash. A small grove of three mature trees (all with substantial lean) and many sprouts were near the Wild Mountain camp.

Leaves and seeds of Singleleaf Ash

A coup;e of pictures of these beauties found along the river.

Amy in a Utah Juniper

Bridget in front of a Utah Juniper.

All trees measured were entered in the Trees Database in the appropriate State.

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dbhguru, ElijahW, Erik Danielsen, Jess Riddle, pattyjenkins1, Will Blozan
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#2)  Re: Green River through Dinosaur National Monument

Postby Devin » Tue Oct 27, 2015 8:41 pm

Thanks for recognizing the single-leaf ash, that is a new species to me.  I know EAB has been confirmed in a Colorado county, probably from transported wood. Hopefully the remoteness and lack of host density will keep this species from being attacked.
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