Record Details
page 15
Oregon Digital
| Field | Value |
|---|---|
| Identifier | ORU_WTXT_021q http://oregondigital.org/u?/wwdl,144 |
| Title | page 15 |
| Relation | The Columbia River Highway |
| Date | 2004-06-17 |
| Rights | This item is in the public domain. Acknowledgement of the University of Oregon Libraries as a source is requested. |
| Type | page |
| Format | Scanned from original document using Silverfast AI 6.0 on UMAX Powerlook III flatbed scanner. Scanned image saved as 16 bit grayscale tiff. 225,526 bytes 8 bit - Gray Gamma 2.2 - grayscale Omnipage 14.0 used to OCR 8 bit greyscale tiff and generate text files for full text access. 16 bit greyscsale tiff edited in Photoshop 6.0: cropped, rotated, reduced in size, levels adjusted for contrast, bit depth reduced to 8 and JPEG created. |
| Description | noteworthy feature of this bridge is its lightness, the total amount of concrete above the ground being only 560 cu. yd. One of the factors making necessary a light structure at this place was the difficulty of securing a firm foundation. The underlying bedrock is covered with a layer of silt and boulders, having an average depth of 25 ft. at the western end of the bridge and with a deposit of drift sand, 50 ft. deep, at the eastern end. The cost of building abutments and piers for a heavy... |
