218 ConHtruction of the Bridye and Cauneuay, dec. 



The height of the roadway ahove the highest high-water 

 level is 9 feet, while the greatest variation in the level of 

 the tide is about 5 feet. 



The whole work extending to a length to 3310 feet, or 

 nearly three-quarters of a mile, is, I believe, the largest ever 

 attempted in the Australian Colonies ; a work which could not 

 have been accomplished in this Colony but for the abundance 

 of labour at the disposal of the Government, and which has 

 been made available throughout the works from their com- 

 mencement. From the slight records that have been kept 

 of the actual cost and duration of the works, at the 

 construction of the causeway I am only able to gather the 

 following particulars : — 



It was commenced in 1830, and finished in 1839, at an 

 average expenditure of £4500 per annum. 



The solid contents of the material of the causeway filled 

 into the river cannot be computed at less than 560,000 

 cubic yards, which, for the quarrying, moving, and placing, 

 have cost \s. h\d. per cubic yard. 



The cost of the bridge, completed, has been £7580, which, 

 added to the former amount, makes a total expenditure of 

 £52,780. 



