The Hoddle Grid is the contemporary name given to the approximately 1-by-0.5-mile (1.61 km × 0.80 km) grid of streets that form the commonly understood central business district of Melbourne Australia. Bounded by Flinders Street, Spring Street, La Trobe Street, and Spencer Street, it lies at an angle to the rest of the Melbourne suburban grid, and so is easily recognisable. It is named after the surveyor Robert Hoddle, who marked it out in 1837 (to Lonsdale Street, extended to La Trobe Street the next year), establishing the first formal town plan. This grid of streets, laid out when there were only a few hundred settlers, became the nucleus for what is now a city of over 5 million people, the city of Melbourne.
The grid of streets that is now central Melbourne was laid out by surveyor Robert Hoddle when he arrived in early 1837 with New South Wales Governor Bourke in order to regularise the fledgling unauthorised settlement. The unusual dimensions of the allotments and the incorporation of narrow 'little' streets were the result of compromise between Hoddle's desire to employ the regulations established in 1829 by previous NSW Governor Ralph Darling, requiring square blocks and wide streets, and Bourke's desire for rear access ways (now the 'little' streets).
The placement of the grid was determined firstly by the fact that the fledgling settlement was already established at that point on the Yarra River, next a natural shipping basin, just below a rocky outcrop known as 'the falls', above which the water was usually fresh. It was placed to run roughly parallel to the course of the river, with its western half closest to the basin, and spanned the mostly gently undulating area between the small hills of Batman's Hill to the west, and Eastern Hill. Elizabeth Street, Melbourne in the centre of the grid coincided with the lowest point and roughly paralleled an existing gully.
The streets were surveyed at 3 chains wide (99ft, or 30m) and the blocks at 10 chains (330ft, or 100m) square, with allotments 1 chain (33ft or 10m) wide, as per Darling's Regulations). However, at Governor Bourke's insistence, 'little streets' were inserted east west through the middle of the blocks to allow for rear access to the long, narrow allotments. These were to be 1 chain (33ft, or 10m), but Bourke's suggestion of keeping the allotments the standard size by making the main streets narrower was resisted by Hoddle, leaving them as surveyed, the end result making the allotments smaller than usual. As per the Darling regulations, the area around the grid was reserved for future expansion and government purposes, and some blocks and allotments were held back from sale and were allocated for government use, public buildings and churches.  The first land sale, of allotments around a block reserved as the site for the Customs House, took place in the settlement on 1 June 1837.
The lack of a public square or formal open space within the grid was criticised as early as 1850, and it has been claimed that Governor Bourke specifically discouraged the inclusion of such spaces “to deter a ‘spirit of democracy’ from breaking out”. However there is little evidence that Bourke had a view on the matter, and the Darling regulations made no mention of including a central square (as either desirable or not). Instead, simple grid plans, with lots or blocks set aside for public buildings and sometimes a park, were standard practice across Australia in government settlements, to facilitate the creation of regular allotments for sale. Notable exceptions include the five central squares of the privately developed plan of Adelaide (also 1839), and the axially placed, though not central, church square set aside in the 1829 plan for Perth. Most of today's well known public squares, such as King George Square in Brisbane, Martin Place in Sydney, and Melbourne's City Square, were created in the 20th century, by widening streets and demolishing buildings.
Robert Hoddle remained the surveyor for the district until 1853, and laid out all the surrounding subdivisions in a north south, east west grid, excepting the area between La Trobe Street and Victoria Street, which is sometimes included in the 'Hoddle Grid', and is usually officially included in the CBD.
This has meant that the original grid sits at a marked angle to the rest of the city, and is easily recognised on any map. Most inhabitants of Melbourne know all the streets of the Hoddle Grid by name, and the order they occur.
The term 'Hoddle Grid' emerged in common use only in the 21st century. While it has long been well known that Robert Hoddle laid out the central grid of streets most commonly referred to as 'the City', it was not traditionally named after him. In the 19th and early 20th Century the focus was more on Collins Street, the grandest thoroughfare, with the most expensive and exclusive buildings along its length, while the western and northern edges comprised unremarkable low rise residential and light industrial development.
The "Melbourne Metropolitan Planning Scheme Report", published by the Board of Works in 1954 refers to the area as 'The Central Business Area' 
The phrase 'CBD' or Central Business District appears in the 1960s, probably within the publication of the 'Borrie Report' in 1964, and the subsequent Melbourne Metropolitan Planning Scheme, enacted in 1968. CBD is still the most common phrase to refer to the central grid area of Melbourne.
Official planning strategies in the 1980s and 90s did not use the phrase 'Hoddle Grid'; for instance the State Government's "Central Melbourne : Framework for the Future", published December 1984, identifies it as 'the formal city grid' (p25), while the City of Melbourne's 'Grids and Greenery', published 1987, picks out the skewed grid of streets in various graphics, but only names it as 'the city centre'.
More recently the Encyclopedia of Melbourne, published in book form in 2005, and online in 2008, calls it the "City Grid', while another entry on Roads, describing the wider subdivision of Melbourne, calls the central area 'the Hoddle grid'.
All major streets are one and half chains (99 ft or 30 m) in width, while all blocks are exactly 10 chains square (10 acres, 201 m × 201 m). The total dimensions, including widths of streets, are thus 93.5 chains (1880m) by 47.5 chains (955m). The grid's longest axis is oriented 70 degrees clockwise from true north, to align better with the course of the Yarra River. The majority of Melbourne is oriented at 8 degrees clockwise from true north - noting that magnetic north was 8.05° E in 1900, increasing to 11.7° E in 2009.
Parallel to the Yarra River:
1 One-way westbound, except two-way between Market and Spencer Streets
2 One-way westbound, except two-way between King and Spencer Streets
3 One-way westbound
4 One-way eastbound
Perpendicular to the Yarra River:
Robert Hoddle also surveyed a separate north-south grid of streets at one mile spacing around the central city grid. The origin of this grid, marked on the 1837 map, was on the crest of Batman's Hill, striking magnetic north for one mile, to an east west line (now Victoria Street/Parade) marking the northern extent of the government reserve outside the central grid. The rest of metropolitan Melbourne generally follows this grid pattern.
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