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CONTRACTS IN FORCE.

Contract dated May 4, 1908, for dredging about 1,916,700 cubic yards of material from Oakland Harbor, Cal.

Rate: 18.8 cents per cubic yard.
Name of contractor: San Francisco Bridge Co.
Date of commencement: May 23, 1908.
Date of completion: July 20, 1910.
Date of approval: May 29, 1908.
Date of expiration: December 6, 1910.

Contract dated November 15, 1910, for dredging about 1,289,200 cubic yards of material from Oakland Harbor, Cal.

Rate: 11.4 cents per cubic yard.
Name of contractor: San Francisco Bridge Co.
Date of commencement: December 30, 1910.
Date of completion: Work still in progress.
Date of approval: November 29, 1910.
Date of expiration: June 6, 1913.

Contract dated December 15, 1910, for placing 3 drawbridges across the Oakland Harbor Tidal Canal in satisfactory condition for operation of their draws by electricity.

Rate: $16,100,
Name of contractor: Frederick C. Roberts & Co.
Date of commencement: January 18, 1911.
Date of completion: Work still in progress; not yet completed.
Date of approval: December 23, 1910,
Date of expiration: June 29, 1911.

RR 4.

IMPROVEMENT OF SAN PABLO BAY, CAL. The only work done during the year was a hydrographic survey to determine the extent of deterioration of the dredged channel through Pinole Shoal and its vicinity. The survey showed a total obliteration of this channel, but there is an available depth generally of about 2 feet more over this shoal than could be found prior to the dredging of the channel.

An estimate of cost of restoring this channel to its original dimensions was given in the Report of the Chief of Engineers for 1910,

Congress having adopted the new project on February 27, 1911, for an enlarged channel, specifications were prepared for dredging this new channel by contract.

Estimate of additional funds required. Amount that can be profitably expended in fiscal year ending June 30, 1913, for works of improvement..

$200,000

page 2352.

APPROPRIATIONS.

June 13, 1902.
Mar. 3, 1903.
June 30, 1906.
Feb. 27, 1911.

Total...

$100,000.00 200,000.00

53, 168. 41 400,000.00

753, 168. 41

1 Exclusive of the balance unexpended July 1, 1911.

COMMERCIAL STATISTICS.

The commerce passing through San Pablo Bay includes all that coming to San Francisco from the Sacramento, San Joaquin, and Napa Rivers, and Petaluma Creek, which, being all carried on stern-wheel Aat-bottom river steamers and barges, is not particularly benefited by the deep channel over the shoal. However, all the commerce of Karquines Straits and Port Costa, which is mostly carried on deep-sea ships, and all vessels going to and from Mare Island Navy Yard are benefited by the dredged channel.

RR 5

IMPROVEMENT OF SUISUN CHANNEL, CAL. No work has yet been done on this channel, and no money has been spent.

The necessary land for the rights of way for the proposed cut-offs on the slough and the harbor at Suisun has not been transferred to the United States, but it is expected that this will be accomplished in the near future and that construction work will soon be commenced.

There has been no work of improvement at this locality, and conse quently no deterioration of improvement.

Estimate of additional funds required. Amount that can be profitably expended in fiscal year ending June 30, 1913, for works of improvement...

1 $12,500

APPROPRIATIONS.

June 25, 1910.....

$12, 500

COMMERCIAL STATISTICS.

Vessel classification.

It has been impossible to obtain any exact data as to the classification of the vessels using this stream.

Freight traffic.

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RR 6.

IMPROVEMENT OF SAN JOAQUIN RIVER, CAL. At the beginning of the fiscal year it was found that to obtain a channel in Stockton Channel 200 feet wide and 9 feet deep at low water, as required by the project adopted by Congress on June 25, 1910, would require the removal of about 170,000 cubic yards. It was also found from a survey that it would require the removal of about 90,000 cubic yards additional to extend this channel 75 feet wide and 4 feet deep at low water up Mormon Slough to Miller's warehouse, a distance of 4,500 feet. This work was done under contract and completed in January, 1911, and the full channel dimensions required by approved project were thereby obtained. There was a total of 275,285 cubic yards dredged at a contract price of 6.89 cents per cubic yard.

The floods in the early part of 1911 brought down large quantities of detritus that was not carried off by the diverting canal to the east. From a survey made recently it was found that the deterioration in Mormon Slough amounts to about 34,000 cubic yards. It is estimated it would cost about 7 cents per yard to redredge this channel with a clamshell dredge.

So far Stockton Channel has escaped deterioration from this source, but it is probable that another rainy season will carry the material on into the channel where it will have to be removed by hydraulic dredge at about 12 to 15 cents per cubic yard.

Estimate of additional funds required. Amount that can be profitably expended in fiscal year ending June 30, 1913, for works of improvement and for maintenance..

1 $100,000

Aug. 14, 1876. June 14, 1880. Mar. 3, 1881. Aug. 2, 1882. July 5, 1884. Aug. 5, 1886. Aug. 11, 1888. Sept. 19, 1890. July 13, 1892. Aug. 18, 1894. June 3, 1896.

APPROPRIATIONS.
$20,000 Mar. 3, 1899.

$20,000 20,000 June 13, 1902.

18,000 40,000 | Allotted from act of Apr. 28, 40,000 1904..

35, 170 20,000 Mar. 3, 1905.

20,000 18,750 Mar. 2, 1907.

30,000 25,000 Mar. 3, 1909.

20,000 75, 000 June 25, 1910..

75,000 65, 000 Feb. 27, 1911.

25,000 50,000 57,750 Total.....

674, 670

CONTRACT IN FORCE. Contract dated September 23, 1910, for dredging about 257,000 cubic yards of material from Stockton Channel and Mormon Slough, Cal.:

Rate: 6.89 cents per cubic yard.
Name of contractor: Antioch Dredging Co.
Date of commencement: October 3, 1910.
Date of completion: January 7, 1911.
Date of approval: Emergency contract, not approved by Chief of Engineers.
Date of expiration: January 1, 1911.

1 Exclusive of the balance unexpended July 1, 1911,

COMMERCIAL STATISTICS.

Season of navigation.-Opened, January 1; closed, December 31.

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Mill stuffs.
Grain.
Hay...
Cord wood.
Merchandise.
Tan bark.
Lumber.
Potatoes..
Onions..
Beans.
Fruit and vegetables.
Vehicles.
Live stock.

2,681 cords.
21,323,966 feet.

96,445 $4,822, 250 172,537 6,901, 480

4,061 40,610 4,987 24,937 222, 434 16,682,550

2,016 47,092 39,816 522,647 48,062 956, 240 18, 615 376, 030 12,993 649, 650 4,401

216, 440 814 1,300,000 4,500 338, 182

Miles.

100

90 100 50 90 100 100

75 100

50 100 100 100

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175

1,625.
11,512 head.

Total..

631,681 32,878, 108

RR 7.

IMPROVING STOCKTON AND MORMON CHANNELS, CAL. At the beginning of the year work was in progress under contract with the Standard American Dredging Co. on the canal section of the Diverting Canal being constructed to divert the waters of Mormon Slough across the country east of Stockton and into the Calaveras River. Work was completed on September 3, 1910, a total of 87,437 cubic yards having been excavated during the year at a cost of'15 cents per cubic yard. A total of 1,465,563 cubic yards of material was excavated in constructing this Diverting Canal, one railroad and six highway bridges were built, and one railroad bridge was extended.

In September, 1910, the Diverting Canal was cleaned of weeds, willows, and brush by hired labor at a total cost of $378.85.

This canal was given a severe test during the early part of this year when a succession of floods caused unusually high water several times, but the levee on the lower side of the canal proved ample to withstand all water turned into the canal. Considerable driftwood was lodged

against the bridges over the canal, some pile supports were knocked out, approaches to the bridge were washed out, and the retaining levee broken at one place. All damage done to bridges and approaches except in the case of the Sanguinetti Bridge was repaired by hired labor at a total cost of $2,966.54, including some incidental expenses. The country to the east and north of the canal was flooded for several miles and damage was done to early crops, fences, and buildings. As far as is known, the damage done to the land was not permanent and the land has been put into crops this year. Considerable additional expense for pumping was rendered necessary in some cases. It is not thought that the damage can be attributed solely to the diverting canal. The floods in this section were greater than usual and the levees on the Calaveras River above the canal had been allowed to deteriorate so as to be of little value. With the funds available it is not practicable to make the canal of sufficient size to carry all the flood water, but the channel will be cleared at the more congested parts.

This canal, however, does not entirely fulfill the purpose of the project to keep material out of Stockton Channel. The south bank of Mormon Slough above the head of the canal is overflowed at high water and considerable quantities of detritus are carried down into the improved channel in Mormon Slough and will doubtless extend into Stockton Channel in the course of time. This had been foreseen and the city of Stockton and private owners informed. The Diverting canal and levees protected the city of Stockton from being flooded two or three times during the rainy season.

The high water scoured out the channel in the full length of the Canal, and it is now in better condition that it was when first completed.

Aside from the above flood damage very little deterioration to Government works at this locality has taken place, as all the works have been but recently constructed. It is proposed to expend the balance on hand in increasing the water-carrying capacity of the channel.

This improvement is considered worthy of maintenance to divert the waters of Mormon Slough away from Stockton Channel and save some of the expensive annual dredging found necessary in past years.

Estimate of additional funds required. Amount that can be profitably expended in fiscal year ending June 30, 1913, for maintenance of improvement....

1 $25,000

APPROPRIATIONS.

June 13, 1902...
Mar. 3, 1903.
Apr. 28, 1904.
Mar. 3, 1905.
Mar. 4, 1909.

Total.....

$50,000 50,000 75,000 49, 316 56, 079

280, 395

1 Exclusive of the balance unexpended July 1, 1911.

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