Tenmile Creek and Straight Creek approach flood stage as spring runoff lets loose
With river flows on the rise, Summit County government encourages residents and visitors to be mindful of high water levels and potential flooding throughout the area. The county has provided the following tips to keep safe during flooding:
• If flooding occurs, get to higher ground immediately.
• Stay away from flood-prone areas, including dips, low spots, valleys, ditches, washes, etc.
• Avoid flooded areas and those with fast-moving water.
• Do not attempt to cross a flowing stream. Six inches of moving water is all it takes to sweep a person off his or her feet.
• Don’t allow children or pets to play near high water, storm drains, culverts or ditches.
• Flooded roads could have significant damage hidden by floodwaters. Never drive through floodwaters or on flooded roads. If your vehicle stalls, leave it and seek higher ground. It only takes two feet of water to wash away most cars.
• Do not camp or park your vehicle along streams and washes, particularly when water levels are high or fluctuating.
When recreating in or around the water, use the proper size and type of personal floatation device.
• Anglers should wear wading belts to prevent water from entering waders during a fall.
• Be especially cautious at night, when it is harder to recognize flood dangers.
• Monitor NOAA for vital weather-related information.
Members of the public are encouraged to review the Summit County Swift Water Safety and Flood Preparedness Guide at SummitCountyCO.gov/flood.
The water is roaring across Summit County. Tenmile Creek, Straight Creek and the Snake River are all approaching flood levels as the great 2019 spring runoff rushes in with thunderstorms on the way this weekend.
After a cold, wet May, temperatures are finally rising in Summit, with highs in the 60s and lows in the 40s creating the conditions necessary for the snowpack to crack and crumble.
Tenmile Creek is one of the best gauges of how powerful the runoff is. The stream is currently cresting at 3.88 feet, with overflows into low-lying areas in and west of Frisco beginning at 4.8 feet.
At 5 feet, Tenmile Creek is at flood stage. At that point, there will be minor flooding of roads and properties along Tenmile Creek. At 6.5 feet, or moderate flood stage, houses begin to flood. Major flood stage starts at 7.5 feet, with significant flooding in Frisco and on the westbound lane of Interstate 70.
Residents should take some comfort in knowing that Tenmile Creek never has gone above 5.14 feet, a mark set June 17, 1995. Frisco authorities have continued to warn residents about potential flooding, with town and county staff on standby in case banks get run over.
The Snake River is currently sitting at 2.7 feet, with flood mitigation action called for at 3.3 feet. The Snake’s record crest was set June 6, 1972, when it reached 3.88 feet. At 3.8 feet, Keystone begins to flood, but that level has been reached only twice since record keeping began there in the 1940s.
Straight Creek in Dillon is currently at 4.86 feet, with action stage at 5.3 feet and flood stage at 6 feet. That stage never has been reached in recorded history, with Straight Creek topping out at 5.78 feet June 17, 1995.
Water flows into and out of local reservoirs also are rapidly speeding up. On Friday, Green Mountain Reservoir started ramping up outflows into the Blue River. Starting at 800 cubic feet per second, the reservoir will increase flows by 50 cfs every two hours until it reaches 1,400 cfs at 4 a.m. today. That flow will be maintained until further notice.
The increased flows are meant to support the Coordinated Reservoir Operations initiative which seeks to enhance spring water flows consistent with the Upper Colorado River Endangered Fish Recovery Program. The conservation program seeks to boost the number of humpack chub, razorback sucker, bonytail and Colorado pikeminnow populations in the Blue.
Further south, the Dillon Reservoir is rapidly filling up after space was made for runoff these past few weeks. Water is dumping into the reservoir at a rate of more than 2,100 cfs, with outflows into the Blue River under the dam reaching up to 700 cfs. The reservoir is currently 83% full and just 15 feet shy of reaching peak elevation.
As far as weather, the weekend is looking to bring a few more showers in the area. Today will see possible thunderstorms in the morning with scattered showers throughout the evening. Sunday will see scattered thunderstorms through the day, with light rain possible again in the evening.
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