The Blair Street Bridge

**Ponto Blair Street** ko pont gonɗo e beton e njamndi, gonɗo e laawol mawngol Lyell rewrude e wuro New Norfolk, rewrude e maayo Derwent to Tasmanie, to Ostarali. Ko ɗum woni jokkorgal yah-ngartaa mawngal e nder njuɓɓudi wuro ngoo, pont oo ina waɗi laawol gootol[3] ngol laabi kuutorteeɗi renndini ceertuɗi banngeeji ɗiɗi ɗii kala.[4] Timminii e hitaande 1974, ko ngol woni ponto nayaɓo mahngo to New Norfolk, tawi ƴellitaare ndee ina foti daranaade ilam e nder falnde hade mum sosde weiruuji Meadowbank.[5][note 1]

## Tariya
Ko ɓuri anndeede ko "Ponto Norfolk keso", ko nanndi e ɗuum, pontooji joɗɗinaaɗi to New Norfolk ina njogii daartol keewngol gila e fuɗɗoode teeminannde 19ɓiire. Ponto leɗɗe gadano mahaaɗo e maayo Derwent to laawol Bridge, sara pont Blair Street hannde oo, timminaama e hitaande 1834.[7] Ndeeɗoo pont ko ƴellitaare mawnde, jokkondirnde New Norfolk e diiwanuuji taariiɗi ɗum ko adii fof, ina weeɓna yah-ngartaa e njulaagu. Nde mahiraa ko e gardagol balloowo seneraal William Sharland, jeyaaɗo e hitaande 1825 jeyi anndiraaɗo Woodbridge. Toll mooftaama ngam taccude pont oo, haa jooni ko e lewru juko hitaande 1880.[8]

Toll House mahiraa ko e hitaande 1841, ina moofta njoɓdi haa hitaande 1880.

Maayo Derwent ina heewi ilam[9] e nder yontaaji, pontooji garooji e hitaande 1880[10] e 1931[11] mahaa ko sara nokku gooto.[12][13] Heddiiɓe e ponte tati gadane ɗee, ina heen geɗe ummoriiɗe e mbaydi asliiji 1834 e kaaƴe ɓoornaaɗe caggal ɗuum ɗe Victoria ɓoornii e pont ɗiɗaɓo oo, ina mbaawi yiyeede haa jooni sara Woodbridge to joofnirde Bridge Street.

Ko adii mahngo ponto Blair Street, wuro New Norfolk tuugnii ko e ponto njamndi e beton ɓooyɗo mahaaɗo e hitaande 1931 ngam wallitde yah-ngartaa e maayo Derwent.[14][15][16] Kono noon, ngool ponto ina ɓeydoo waasde jogaade doole ngam heblude ko ɓeydotoo e ɗaɓɓaande njulaagu hannde, sibu ina sikkaa ko doole mum ŋakki, njaajeendi mum ina famɗi, e keerol jolngo 15 ton (15 ton juutngol; 17 ton juutngol) ngol ɓe ndokki e hitaande 1966.[17] E anndude haaju taƴgol maayo ɓurngol tiiɗde e moƴƴude, peeje mbaɗaama ngam mahngo pont keso.[17]

## Mahugo
Pewnugol ngol fuɗɗii ko e lewru ut 1971, ngol joofi ko e nder duuɓi ɗiɗi e feccere e njoɓdi 900 000 dolaar Amerik.[18] Golle fenaande leɗɗe mballitii heɓde pier maayo e nder mahdi.[19] Foundations ina kuutoroo footings yaajɗi ngam abutments e piles driven ngam piers, ngam tabitinde darnde e ustude baasal koɗki. Design ina teeŋtina darnde juutnde e banngeeji ngam waawde haɓaade ilam e nguleeki bonki. Feereeji estetik, ko wayi no balustrading minimalist e annoore, ina ɓeyda njiimaandi pont oo.[20] Injiniyankooɓe ndiyam ƴeewtindorii geɗe ko wayi no ɓuuɓri maayo, tolno ndiyam, e sifaaji nokkuuji ilam ngam anndude no pont oo waawirta ɓuuɓde e sahaaji ndiyam toowɗam.[6]

Ngam ustude baasal ilam baawzo battinde e pont oo e laabi mum, geze diisnondiral keewze naatnaa e eɓɓaande pont Blair Street. Ina jeyaa e ɗeen geɗe ƴellitde dekirɗe pont oo haa to tolno toɗɗaaɗo dow tolnooji ilam potɗi reweede ɗii, tawa ina addana ndiyam ɗam rewde les mum tawa bonnataa e mbaydiiji ɗii. Yanti heen, jolɗe e jolɗe pont oo ina tiiɗtinaa ngam waawde haɓaade doole ndiyam ɗe ndiyam ilam waɗata.[21]

Pont Blair Street timmuɗo oo ina waɗi 200 meeter (650 ft) e njuuteendi mum ko 35 meeter (116 ft) dow maayo ngoo.[3] Ina waɗi nate beton tiiɗɗe ngam dartinde e jolɗe njamndi ɗe Russell Allport & Co to Moonah feewni. Design pont oo ina waɗi 4,74% e ŋorol ngol, ina weeɓi haa 3% e ŋorol gonngol e dow laawol Montagu,[22] ngam tabitinde semmbe e jolɗe teeŋtuɗe e nguleeki bonki.[23]

## Nafoore
Nde nde timmi, pont Blair Street hollitii yahrude yeeso no feewi e nder njuɓɓudi wuro ngoo, rokki kisal, njuɓɓudi, e wellitaare wonande hoɗɓe e hoɗɓe. Ponto Blair Street oo ittii caɗeele ɗe njuɓɓudi ɓooyndi ndii joginoo, rokki otooji e yahooɓe laawol ngol aldaa e keerol, tawa kadi ina ɓeyda jokkondiral hakkunde nokkuuji ɗiɗi mawɗi ƴellitaare wuro ngoo.

## Teskorɗe
Maayo Derwent yanii no feewi to New Norfolk ñalnde aset 23 abriil 1960. Ina hiisa wonde ngool ilam ina fotnoo wonde ilam gootol e nder duuɓi capanɗe joyi, tawi ina yahra e 120 000 cusec