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Tahoe is becoming
popular on the Web
By Tanya Canino
The Associated Press
TAHOE CITY, Calif.—With the
addition of remarkable images
from the recent mapping of Lake
Tahoe’s bottom, visits on the Lake
Tahoe Data Clearinghouse web
site have jumped dramatically.
Since it went on-line Jan. 16, Lake
Tahoe’s “virtual library” had about
3,000 visits in its first seven months
on the Internet. But after the ba
thymetry of Lake Tahoe was put on
the web site in mid-August, the
number of visits has risen to 12,000.
“I watch the hits and it’s really
climbed dramatically. The ba
thymetry has really attracted a lot
of attention,” says Alexander
Evans, the site’s webmaster and a
scientist with the U.S. Geological
Survey’s National Mapping Divi
sion in Menlo Park.
Between Aug. 6 and Aug. 13, the
USGS’ coastal and marine geology
group mapped the floor of Lake
Tahoe using acoustic sonar aboard
the research vessel Inland Surveyor.
The mapping revealed lake
floor sediment patterns, sunken
artifacts and photograph-like
maps of the bottom of Lake Tahoe.
“This is a key road map for future
research and restoration,” Interior
Secretary Bruce Babbitt said in an
online press release. “We need a
comprehensive understanding of
all factors — particularly sedimen
tation patterns and rates and the ex
act contours and water volume —
so that we can accurately predict
what work will be most effective in
restoring clarity to the lake.”
High resolution, three-dimen
sional digital photographs are in
eluded on the Lake Tahoe Data
Clearinghouse site, showing the
lake’s depths in multi-colors and
pulling out different views of Lake
Tahoe from under the water.
The Lake Tahoe Data Clearing
house provides data from the
USGS and has links to otherTahoe
related agencies such as the U.S.
Forest Service, the National Re
source Conservation Service, the
Tahoe Regional Planning Agency
and the U.S. Environmental Protec
tion Agency, among others.
It was started following the
Presidential Forum in July 1997.
Many Tahoe agencies use Geo
graphical Information Systems
software to create maps and data
banks fortheiruse. The LakeTahoe
Data Clearinghouse is trying to post
that information on the web site or
link it to other web sites so it can be
used by all basin agencies, scien
tists and interested people.
The Lake Tahoe Data Clearing
house is an easy-to-follow site
which provides questions and
help about downloading files, as
well as information on various
Tahoe agencies, the Presidential
Forum and its status report on
“deliverables” that the forum has
or will produce.
There are aerial photos of Lake
Tahoe, watershed maps, TRPA
plan area statement maps, land ca
pability maps, topographical
maps, water data, scientific re
ports on various Tahoe subjects
and even the day-to-day log of the
Inland Surveyor while it mapped
the bottom of Lake Tahoe.
The web site is located at
http://blt.wr.usgs.gov/
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