#There's no specific measurement given There are a few descriptions of the bridge, but none provide a measurement. However, it stretches across the River Rhoyne and

had no rivals save for the Bridge of Dream in the Rhoynar festival city of Chroyane.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

It is so epic in fact that

the Long Bridge of Volantis stands today as the longest bridge in all the known world. Lomas Longstrider named it one of the nine wonders made by man in his book of that title.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

Due to the difficulty and the tides of the Rhoyne, the bridge took 40 years to complete.

Tyrion describes it as such:

The gateway to the Long Bridge was a black stone arch carved with sphinxes, manticores, dragons, and creatures stranger still. Beyond the arch stretched the great span that the Valyrians had built at the height of their glory, its fused stone roadway supported by massive piers. The road was just wide enough for two carts to pass abreast, so whenever a wagon headed west passed one going east, both had to slow to a crawl.
^{-A Song of Ice and Fire: Book 5 - A Dance With Dragons, Chapter 27 (Tyrion VII). George R. R. Martin}

So I'd say it's fairly long, but not too wide; given that the Long Bridge crosses at the southern delta of the River Rhoyne of which it is said:

Mother Rhoyne waxes so wide that a man upon a boat in the center of the stream cannot see a shore to either side.
^{-A Song of Ice and Fire: Book 5 - A Dance With Dragons, Chapter 14 (Tyrion IV). George R. R. Martin}

There's no specific measurement given

There are a few descriptions of the bridge, but none provide a measurement. However, it stretches across the River Rhoyne and

had no rivals save for the Bridge of Dream in the Rhoynar festival city of Chroyane.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

It is so epic in fact that

the Long Bridge of Volantis stands today as the longest bridge in all the known world. Lomas Longstrider named it one of the nine wonders made by man in his book of that title.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

Due to the difficulty and the tides of the Rhoyne, the bridge took 40 years to complete.

Tyrion describes it as such:

The gateway to the Long Bridge was a black stone arch carved with sphinxes, manticores, dragons, and creatures stranger still. Beyond the arch stretched the great span that the Valyrians had built at the height of their glory, its fused stone roadway supported by massive piers. The road was just wide enough for two carts to pass abreast, so whenever a wagon headed west passed one going east, both had to slow to a crawl.
^{-A Song of Ice and Fire: Book 5 - A Dance With Dragons, Chapter 27 (Tyrion VII). George R. R. Martin}

So I'd say it's fairly long, but not too wide; given that the Long Bridge crosses at the southern delta of the River Rhoyne of which it is said:

Mother Rhoyne waxes so wide that a man upon a boat in the center of the stream cannot see a shore to either side.
^{-A Song of Ice and Fire: Book 5 - A Dance With Dragons, Chapter 14 (Tyrion IV). George R. R. Martin}

#There's no specific measurement given There are a few descriptions of the bridge, but none provide a measurement. However, it stretches across the River Rhoyne and

had no rivals save for the Bridge of Dream in the Rhoynar festival city of Chroyane.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

it is so epic in fact that

the Long Bridge of Volantis stands today as the longest bridge in all the known world. Lomas Longstrider named it one of the nine wonders made by man in his book of that title.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

#There's no specific measurement given There are a few descriptions of the bridge, but none provide a measurement. However, it stretches across the River Rhoyne and

had no rivals save for the Bridge of Dream in the Rhoynar festival city of Chroyane.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

It is so epic in fact that

the Long Bridge of Volantis stands today as the longest bridge in all the known world. Lomas Longstrider named it one of the nine wonders made by man in his book of that title.
^{-The World of Ice and Fire, Volantis. George R. R. Martin}

Due to the difficulty and the tides of the Rhoyne, the bridge took 40 years to complete.

Tyrion describes it as such:

The gateway to the Long Bridge was a black stone arch carved with sphinxes, manticores, dragons, and creatures stranger still. Beyond the arch stretched the great span that the Valyrians had built at the height of their glory, its fused stone roadway supported by massive piers. The road was just wide enough for two carts to pass abreast, so whenever a wagon headed west passed one going east, both had to slow to a crawl.
^{-A Song of Ice and Fire: Book 5 - A Dance With Dragons, Chapter 27 (Tyrion VII). George R. R. Martin}

So I'd say it's fairly long, but not too wide; given that the Long Bridge crosses at the southern delta of the River Rhoyne of which it is said:

Mother Rhoyne waxes so wide that a man upon a boat in the center of the stream cannot see a shore to either side.
^{-A Song of Ice and Fire: Book 5 - A Dance With Dragons, Chapter 14 (Tyrion IV). George R. R. Martin}