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[![lovingly rendered pictures of
furigana.](https://i.stack.imgur.com/ZspvO.png)](https://i.stack.imgur.com/ZspvO.png)

Where does the furigana split on the word 小路{こうじ}? Does the う belong to 小 or
does it belong to 路? Or is the word considered to have a 熟字訓読み (i.e. no
split)?

小 has the reading こ

路 has the reading じ

Where does the う fit in this?

小路{こうじ}、小{こ}・路{うじ}、 or 小{こう}・路{じ}?
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etymology readings furigana
Where does the furigana split on 小路?
If I had to say, ''う'' fits 路. But almost all people don't care, I think, and
neither do I. It's general to be written like [小路]{こうじ}.  
The original form of こうじ was こみち（小さい[路]{みち}） in hundreds years ago.  
komiti -> komdi -> -> -> kouji  
  
Japanese language has varied throughout history.  
Vowel reduction and change from ''m'' to ''u'' brought out ''こうじ''.  
As an example similar, [日向]{ひゅうが}, which is the old name of Miyazaki
prefecture, was [日]{ひ}[向]{むか}.  
It has changed like himuka -> himga -> hiuga(=hyuuga)  

Meanwhile, 600-700 years ago, たちつてと used to be pronounced as _ta, **ti, tu** ,
te, to_, so the process of change I gave above doesn't include spelling
mistakes.
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小路 should most likely be split as 小 (こう) 路(じ). The vowel lengthing is probably
emphatic and used to distinguish it from other homophones. Also to mention my
IME puts 小路 at the bottom of the list for こうじ so I think it is not a common
reading.

Goo 辞典 says it is a sound change from こみち, and it also links to 大路 (おおじ).
While it makes no mention of the etymology, just how the sounds ぢ -> じ merged,
I would say 小路 (こみち -> こうじ) changed to contrast with 大路 (おおじ), which has a
long vowel from 大.
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