Raining Rock in Paonia!
 




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“There’s a lane open, can’t I just drive through?
...Right then a huge portion of the rock wall came crashing down.”


View slideshow of preparing for rock blasting on McClure pass.




















“After long days and nights, the crews reopened CO 133 once again Saturday evening, May 6th, this time hopefully for the entire spring and summer travel season.”

 

Springtime in the Rockies means many things. Winter driving conditions are pretty much over except for the occasional blizzard that holds us captive for another few days. Green is the dominant color after a long winter of rather drab hues. We see more critters as we pass through the canyons and near rivers. In early spring we also see traces of rocks falling down from the steep canyon walls. Sometimes those rocks in the extra large size come crashing down on the roadways. Colorado has seen its share of rockslides that have taken the lives of too many people. In order to minimize that risk, CDOT crews inspect the many areas of the state that are suspect for rockslides. Just last month, CO 133 near the Paonia Reservoir area experienced a serious slide that closed the highway for several days.

PIO and Quarterly editor Brian Jordon (italicized) got the first call:

Monday evening, April 24, I got a call at the TOC at the CTMC (Colorado Traffic Management Center) saying there had been a rockslide on Colorado State Highway 133 west of McClure Pass. The initial report indicated no vehicles involved, no injuries, might just be minor. Such was not the case. In fact the rock sliding had only just begun. I talked to Region 3's Frank Galvin, and he was on the scene shortly after the first slide. Part of the time he was working as a flagger, stopping cars and trying to convince them to turn around. One driver said, "There's a lane open, can't I just drive through?" Galvin said, "Right at that time a huge portion of the rock wall came crashing down. There was no more arguing about trying to drive through." The chunk that came down was about the size of a small school bus.

When the engineers and inspectors looked closely at the mountainside, they discovered a larger rock slab that was loose and required immediate attention to bring down the potential threat. As the road was closed, the Colorado Traffic Management Center in Golden quickly went to work lighting up the necessary message boards, advising travelers that CO 133 was closed once again -- use alternate routes. That affected many drivers since the road over McClure pass is very popular and well traveled, particularly in the warmer months. The Public Information Specialists at the Traffic Management Center began communicating throughout the affected area with radio and television stations, newspapers and fax machines.

Just being at the scene was a little unsettling for many of the workers, me too. A gray stream of powdered shale and sandstone was leaking out from behind the precarious looking rock wall regularly. Indeed a gush of pebbles and dust shimmered down the wall right before the drilling began, startling us all. When CDOT geologist Ty Ortiz first saw the void left by the rock fall, he confirmed what workers on the scene suspected ever since the first slide. A gigantic sheet of rock was unstable and would have to be brought down. Holes would have to be drilled and dynamite used to blast it down. Yenter Construction of Grand Junction also had to blast many of the boulders already down into chunks small enough for the front-end loader to handle.


The staff was interviewed many times about the rockslide. Nancy Shanks is the CDOT Public Relations person in the southwestern region of Colorado responsible for communicating to the CDOT community and the public about incidents of a significant nature. Her immediate grasp of the situation and quick response to the media let travelers know that the reopening of the road would come as soon as the safety of the public was assured.



(Above) The first step
to "taking down the mountain" is to drill a
hole approximately 8 feet deep for placement of dynamite. (Right) Crews prepare the area for
rock blasting to relieve
a weakened shelf
of sandstone.

Photography by Michael Tamburello




Many drivers in the area use SH 133 several times a day to get between Paonia and Carbondale and Galvin said at first getting the word out to everyone was a big job. We got the word out immediately about the closure from the CTMC (Colorado Traffic Management Center), but making clear when vehicles could get by and what sort of delays were to be expected was tricky. SW CDOT PR specialist Nancy Shanks did a great job of getting the details and disseminating the latest in a very timely manner. When Art Director Michael Tamburello and I drove to the scene some ten days after the slide, there was a full newspaper article with the latest details taped to the counter at the gas station where we filled up.


In early May, crews from Yenter Construction and CDOT mobilized equipment to the area and barriers were placed in preparation for blasting.

Region 3 Safety Officer Marty Medina was a familiar sight at the scene, constantly making sure there would be no unforeseen complications. He helped keep traffic flowing as smoothly as possible…when possible. He also oversaw the building of a makeshift barrier on the guardrail to help protect the comparatively delicate Paonia Reservoir spillway directly across the highway from the unstable wall of rock.

A few days later the blasting began followed by clean up of the large amount of debris. Engineers and inspectors surveyed the area. Rock scaling operations continued to make the area safe. After long days and nights, the crews reopened CO 133 once again Saturday evening, May 6th, this time hopefully for the entire spring and summer travel season.



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