For IMPROVE-2, raingauges were set up at five locations.  Location data, as
given by Pascal Storck (who was in charge of the raingauges) are given below.
I'm using the 3-letter codes shown to identify these stations.

Three are collocated with SNOTEL sites.  They are:

joj (Jumpoff Joe Mountain):         44.3867  -122.1672  1067 m
snj (Santiam Junction):             44.4350  -121.9450  1143 m
snp (Santiam Pass, aka Hogg Pass):  44.4206  -121.8569  1451 m

Additional metadata for the SNOTEL sites can be found at
http://www.or.nrcs.usda.gov/snow/snowsurveys/OR_metadata.html.  The metadata
available online only give lat/lon to 1/100 of a degree (~1 km) precision, to
prevent vandlaism/tampering.  The lat/lon's provided by Pascal (given above)
are more precise, and should be used.

One is collocated with an EPA site:

fal (Falls Creek):                  44.3944  -122.3722   530 m

The final one was near the Corbett SnoPark:

cor (Corbett SnoPark):              44.4194  -121.7917  1300 m

Pascal's original data are in the MS Excel files:

imp2rg1.xls
imp2rg2.xls

I've combined these into a single file and cleaned them up a bit.
The combined file is:

improve2-gauge-data.xls

For each gauge, there are two columns, one recording times of bucket tips
(Pascal Storck has stated that these are in Pacific Standard Time) and
the other simply counting the tips.  Each bucket tip is 1 mm of rainfall.

All 5 sites have more than one time series.  This is due to the fact that data
were retrieved at an interrim time (9 Dec 2001), so the data before and after
that time are time series, referred to as "A" and "B".  Also, all of the sites
had two gauges, solely for the purpose of cross-checking to add confidence to
the data.  Thus, for example, the column "snp2A" refers to gauge number 2 at
the Santiam Pass (aka Hogg Pass) site, during time period A (prior to 9 Dec).

Here are some of Pascal's additional comments on the data (edited by MTS).

"On 12/9/2001 the gauges at high elevation were visited to remove
excess snow from the site.  At that time, the gauges at Santiam Pass and Corbett
were completely buried, and the Santaim Junction gauges had just been buried by
the previous event.  By having two gauges at each site, the time of burial
could be determined and all suspect data have been removed from the time series.
Duplication of gauges also provides confidence in the readings
when both agree.  Jumpoff Joe was not accessible during the 9 Dec visit
(due to its distance from the main highway) and no maintence could be
performed.  The Santiam Junction gauges failed completely after 12/9 and no
data are available.  Santiam Pass Gauge 1 underestimated the 12/13 event (the
readings from Gauge 2 should be used during this event)."

Mark Stoelinga, 29 August 2002