FLOOD00372

• Designation Number: 294
• County: Boulder
• Community: Unincorporated Boulder County
• Stream Name: North St. Vrain and St. Vrain Creeks
• Title: Floodplain Information Report - North St. Vrain and St. Vrain Creeks
• Date: 12/1/1987
• Designation Date: 1/1/1989
• Floodplain - Doc Type: Floodplain Report/Masterplan

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1941 FLOOD

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Two Bridges

on 52 Are Out

1938 FLOOD

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Longmont Times-Call
Saturday, September 3, 1938

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Two bridges on Highway 52, constructed during the past year, have been
washed out by the high waters making travel on this highway to the County
line impassable. These bridges will have to be replaced. The approaches
to the bridges were also damaged. But otherwise the oiled highway was not
damaged,

Traffic over the St. Vrain bridge south of the sugar factory was dan-
gerous Saturday morning as it was feared it might be carried away.

The river dam south of the sugar factory, from which water is secured
during the campaign had been washed out.

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Longmont Times-Call
Saturday, September 3, 1938

St. Vrain Creek east of Lyons, 1941.

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Scores
As

of
Flood

Fami lies Flee
Strikes

Homes in Night
Longmon t

Longmont Times-Call

Monday June 23, 1941

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St. Vrain

Floods

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Scores of families along the St. Vrain River near Longmont were
driven from their homes Friday night when that stream, swollen by cloud-
bursts in the mountain district, went out of its banks and flooded the low
lands from First Avenue south.

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Park
more
east

Another flood rolled into Longmont from
athletic field with nearly three feet of
than a hundred residences and places
sections of Longmont.

Highways leading into Longmont from all directions were under water
but travel over them was possible at all times Saturday morning. A number
of service stations and other stores on North Main Street and along the
highway south remained closed when flood water covered the pavement from
a foot to two feet in depth,

the north, .covered Roosevelt
water, filled basements in
of business in the north and

Roaring out of darkness split by almost continuous lightning and thunder,
thousands of tons of water swept down the North and South St. Vrain canons
early Sunday morning causing the flood which also took three homes away,
damaged roads, flooded a half dozen houses in Lyons, wrecked bridges and
inundated farm lands...

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L.T. Burgess, chief hydrographer from the state engineer's office. and
J.E. Whitter, division engineer for the Platte area, took slope measurements
and found that st the peak of the flood the depth was 8.07 feet compared with
a normal of 3.26. At 2:14 a.m. Sunday and for two hours the St. Vrain was
measured at 8,900 second feet. Today it measured 595 second feet average.
The average for Sunday wss 2,000 second feet, The river rose to 8,900 second
feet in 30 minutes, The highest ever registered previously was 9,600 second
feet, Commissioner Maier said. The date of this record rise was not
available.

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During the flood tons of silt, sand and rocks were carried down both the
North and South St. Vrains as well as poles. lumber and treea.

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