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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1957 FLOOD

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Longmont Times-Call
Thursday, May 9, 1957

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Rain

Floods
Roads

Many
and

Longmon t
Bridges

Homes,

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The bridge waS gone, also at the west side of McCall Lake,
of Hygiene, and the north end of the old iron bridge, east of
Filter Plant, was cut through by St. Vrain River waters.

northwest
Longmont

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Rain flooded Longmont in a deluge throughout Wednesday night and in-
to the morning hours today, leaving washed out bridges, cut away roads
and fills, flooded basements, collapsed ditch fills, and pouring well
over four inches of moisture for 18 hours...

Victims of worst damage were bridges throughout Boulder County and on
over into Weld County to the east. Closed when the St. Vrain continued
to cut relentlessly into the approach at its north side Was the bridge
on the Hover Road, south of the Third Avenue. By 8 a.m. waters had
chewed through the blacktop surface, and was threatening to make the cut
acrOSS the highway a complete one.

The bridge across the St. Vrain on the airport road, just south of
Ninth Avenue, appeared to survive the overnight downpour, but about noon
as a tree stump caught in midstream and changed the courSe of the water,
the north approach began to wash and shortly thereafter the approach be-
gan to crumble.

More than 12 inches of water threatened to close West Ninth Avenue
just beyond the Hover Road, The bridge north of Batchelder School was
out, as was the one into Niwot, west of Highway 287. At Crane Hollow,
west of Hygiene, the bridge was gone, and the road closed. The South
Sunset Drive bridge, over the St. Vrain, also was closed to traffic,
with a 20 foot cut across the highway on the south approach.

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St. Vrain Creek east of Lyons, 1957.

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