Unimpressed with the selection of flat-pack bridges offered a design from the Argos catalogue was chosen via public vote in the spring of 1757.

Upon the bridges arrival the instruction booklet was lost immediately by head surveyor Robert Mylne

ALTERNATIVE DESIGNS FOR THE FIRST BRIDGE AT BLACKFRIARS February 1756

Old illustrations of the first and second Blackfriars Bridge are on the walls of the underpass beneath the bridge.
The illustrations are from the Guildhall Library

The bridge itself was photographed in 2023 Click for a larger image
And on the same day Click for a larger image

The first figure shows various sketches for the first bridge (a bridge designed by Robert Mylne):
To the Right Hon.Slinglsby Bethell Esq. Lord Mayor. To the Rt. Worshipful Court of Aldermen & Common Council of ye City of London’.
These Designs for Building a Bridge with Stone to Cross the River Thames From Blackfryers, London to Southwark in Surry’
Is most Humbly Inscrib’d by your Hon most Obedient Humble Servant Edward Oakley
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The resulting design of the first bridge (called here "the new bridge"), by Robert Mylne II:
A View of. Mr. Mylne’s degant Design of a NEW BRIDGE.to be built frome Black Fryers to the opposite Shore. approved by the Committee in Common Council, 1760.
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And in the next picture you can see how the picture fits into the underground passage itself
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Illustration of the first bridge under construction
A VIEW OF PART OF THE INTENDED BRIDGE AT BLACKFRIARS LONDON
IN AUGUST MDCCLXIII

BY ROBERT MYLNE ARCHITECT
ENGRAVED BY PIRANESI AT ROME
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Another illustration of the first bridge during its construction (already in 1766)
PART OF THE BRIDGE AT BLACKFRIARS AS IT WAS IN JULY 1766
Published by John Boydell, Cheapside
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and to the enlarged image
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A view of the new bridge (which would be officially opened only 6 years later, in 1869), and the train station that was built nearby
THE LONDON, CHATHAM AND DOVER RAILWAY STATION AT BLACKFRIARS
Illustrated London News 26th December 1863
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and to the enlarged image
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An illustration of the old bridge from 1797, in the background you can see St. Paul’s Cathedral
BLACK FRIARS BRIDGE
Thomas. Malton 1797
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An illustration of the new bridge from 1869, the view is the same as the previous image, with St. Paul’s Cathedral behind the bridge
BLACKFRIARS NEW BRIDGE
Illustrated London News 6th November 1869
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The opening of the new bridge by Queen Victoria in 1869
HER MAJESTY QUEEN VICTORIA OPENING BLACKFRIARS NEW BRIDGE
Illustrated London News 13th November 1869

HISTORIC IMAGES OF THE BRIDGES FROM THE COLLECTION AT GUILDHALL LIBRARY
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and to the enlarged image
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And finally a text appears about the opening of this Underpass in 1995
THE BLACKFRIARS BRIDGE PEDESTRIAN UNDERPASS WAS OFFICIALLY OPENED ON THE 11TH OCTOBER 1995 BY:

THE RIGHT HONORABLE THE LORD MAYOR OF LONDON, SIR CHRISTOPHER WALFORD
AND
THE WORSHIPFUL THE MAYOR OF SOUTHWARK, COUNCILLOR AUBYN GRALIAM
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(Before the series of illustrations, the installer’s name appears: Printed for T. Kitchin at the Star, Holborn Hill)