Ice Bridge (snow winter sky trees ). Photo by katy99780
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Ice Bridge

Uploaded by: katy99780

Tuesday February 5, 2013

Tok, AK (Current Weather Conditions)

Caption: Doesn't look like anything special, does it. But it is a little bit special. First a hole is drilled in the ice to see how thick it is, then water is pumped up from the river on successive days and left to freeze overnight. When the ice reaches 36 inches or so, then it's safe (enough) for 80,000 lb loaded log truck to go over, and any heavy equipment needed to build road and harvest the fire-killed timber.
Tanana River, north of Tok Alaska.

Manufacturer: Canon

Model: Canon EOS REBEL T3

Orientation: top - left

x-Resolution: 72.00

y-Resolution: 72.00

Resolution Unit: Inch

Software: QuickTime 7.6.6

Artist:

YCbCr Positioning: centered

Copyright: [None] (Photographer) - (Editor)

Compression: JPEG compression

Exposure Time: 1/250 sec.

FNumber: f/10.0

Exposure Program: Landscape mode (for landscape photos with the background in focus)

ISO Speed Ratings: 100

Exif Version: Exif Version 2.2

Components Configuration: Y Cb Cr -

Shutter speed: 8.00 EV (APEX: 16, 1/256 sec.)

Aperture: 6.62 EV (f/9.9)

Exposure Bias: 0.00 EV

Metering Mode: Pattern

Flash: Flash did not fire, compulsory flash mode.

Focal Length: 55.0 mm

User Comment:

SubsecTime: 79

SubSecTimeOriginal: 79

SubSecTimeDigitized: 79

FlashPixVersion: FlashPix Version 1.0

Color Space: sRGB

PixelXDimension: 720

PixelYDimension: 480

Focal Plane x-Resolution: 795.58

Focal Plane y-Resolution: 806.72

Focal Plane Resolution Unit: Inch

Custom Rendered: Normal process

Exposure Mode: Auto exposure

White Balance: Auto white balance

Scene Capture Type: Standard

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Display: 50, 100, 200 Sort: Newest First - Order Posted
10. WurzelDave
7:09 PM GMT on February 12, 2013
Don't look at me it's a formula, so i haven't a clue what it means! :-)
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Member Since: November 23, 2008 Comments: 18026
9. katy99780
10:22 PM GMT on February 11, 2013
Quoting WurzelDave:
Just had a look (as it got me thinking for a change), there is a formula you can use on Ice thickness (Gold's Formula). Great shot Katy.
@L@ way to much brain-work for me Dave, I'll trust you on that one! :)
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8. WurzelDave
8:13 PM GMT on February 11, 2013
Just had a look (as it got me thinking for a change), there is a formula you can use on Ice thickness (Gold's Formula). Great shot Katy.
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Member Since: November 23, 2008 Comments: 18026
7. katy99780
9:38 PM GMT on February 10, 2013
It varies Charlotte. Some areas are hollow, some are a few feet deep. The main channel is maybe 20-30 feet deep.

This part of the river is narrow so the water is channeled fast and deep under the ice.
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6. llpj04
9:14 PM GMT on February 10, 2013
How deep is the river below?
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5. katy99780
8:45 PM GMT on February 10, 2013
Thanks for stopping Arlene. See how the ice bridge has a bit of an upward bulge?
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4. canuckjune
8:15 PM GMT on February 10, 2013
This is interesting and I am glad you add these little tidbits because as they say You are never too old to learn.
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3. katy99780
7:49 PM GMT on February 10, 2013
John it'd be pretty tough driving a loaded log truck through the insulation... :P
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2. papajuan
7:19 AM GMT on February 10, 2013
Looks like they keep the insulation cleaned off.
Looks just like someone is getting ready to fill their ice house
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1. RenoSoHill
5:33 AM GMT on February 10, 2013
Thanks for the explanation! Now I know.
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About katy99780

katy99780

I've lived in Alaska since 1969. I love this wild land. The extremes of the far north shape and affect every living thing. Extremes of weather, elevation, daylight hours, isolation, flora and fauna, nothing in Nature is insignificant.I have a Davis Vantage Pro weather station, uploading to Wunderground, (Turks on the Tundra) the National Weather Service, the Citizen Weather Observation Program and MADIS (Meteorological Assimilation Data Ingest System). "May you have warmth in your igloo, oil in your lamp, and peace in your heart." ~ Indigenous Arctic Proverb

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